爬取的目标网址：
http://www.zdqx.com/qingchun/index.html

话不多说，直接上代码：

import requests
import re,os

headers = {
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36',
    'referer': 'http://www.zdqx.com/pcbz/70270.html',
    'cookie': 'Hm_lvt_303a32038183efa6d8efec90c0031b87=1581472898; Hm_lpvt_303a32038183efa6d8efec90c0031b87=1581472912'
}

def get_urls(url,num_page):
    response = requests.get(url=url, headers=headers)
    response.encoding = response.apparent_encoding
    result = re.findall('<div class="listbox">(.*?)</div>', response.text, re.S)
    urlsTitleList = re.findall('<a href="(.*?)" target="_blank" title="(.*?)">', str(result), re.S)
    pageNumList = re.findall('<em class="page_num">共(.*?)张</em>',str(result), re.S)
    for urlAndTitle,num in zip(urlsTitleList,pageNumList):
        url = 'http:'+urlAndTitle[0]
        title = urlAndTitle[1]
        num = int(num)
        for page in range(1,num+1):
            if page == 1:
                newUrl = url
            else:
                newUrl = url.replace('.html','_%s.html'%page)
            resp = requests.get(newUrl,headers=headers)
            resp.encoding = resp.apparent_encoding
            div_main = re.findall('<div class="main_center_img" style=" min-height: 745px;">(.*?)</div>',resp.text,re.S)

            url_alt = re.findall('<img src="(.*?)"', str(div_main), re.S) # 长度为3
            _url = 'http:'+url_alt[1]
            imgTitle = title+str(page)
            savedata(_url,imgTitle,num_page)

def savedata(url,title,num_page):
    path = '小姐姐图片/第{}页'.format(num_page)
    if not os.path.exists(path):
        os.makedirs(path) #多级目录
    response = requests.get(url,headers=headers)
    response.encoding = response.apparent_encoding
    with open(path + '/' + title + '.jpg',mode="wb") as f:
        f.write(response.content)
    print(title+' 保存成功！')
    f.close()

def download_page(num_page):
    if num_page == 1:
        url = 'http://www.zdqx.com/qingchun/index.html'
    else:
        url = 'http://www.zdqx.com/qingchun/index_' + str(num_page) + '.html'
    get_urls(url, num_page)
    print('第' + str(num_page) + '页采集完毕！')

def main_run():
    want_page = input("您需要爬取第几页？(共1-42页)，输入'all'则爬取全部约10000张高清壁纸:n")
    if (want_page == 'all'):
        for page in range(1, 41):
            download_page(page)
    try:
        num_page = int(want_page)
    except:
        print("您的输入不合法，只能输入纯数字或字符串'all'，请重新输入")
        main_run()
    if(num_page<1 or num_page>42):
        print("您的输入不合法，页码数只能在1-42之间，请重新输入")
        main_run()
    else:
        download_page(num_page)

if __name__ == '__main__':
    main_run()

对于多线程还不太熟悉，就没有用到多线程。

虽然爬取全部约10000张高清图太慢了，但是爬取一页的时间还是可以勉强接受的。