完整代码如下（可直接copy）：

from bs4 import BeautifulSoup
from bs4 import UnicodeDammit
import urllib.request
import threading


def imageSpider(start_url):
    global threads
    global count
    try:
        urls = []
        req = urllib.request.Request(start_url, headers=headers)
        data = urllib.request.urlopen(req)
        data = data.read()
        dammit = UnicodeDammit(data, ["utf-8", "gbk"])
        data = dammit.unicode_markup
        soup = BeautifulSoup(data, "lxml")
        images = soup.select("img")
        for image in images:
            try:
                src = image["src"]
                url = urllib.request.urljoin(start_url, src)
                if url not in urls:
                    print(url)
                    count = count + 1
                    T = threading.Thread(target=download, args=(url, count))
                    T.setDaemon(False)
                    T.start()
                    threads.append(T)
            except Exception as err:
                print(err)
    except Exception as err:
        print(err)


def download(url, count):
    try:
        if url[len(url) - 4] == ".":
            ext = url[len(url) - 4:]
        else:
            ext = ""
        req = urllib.request.Request(url, headers=headers)
        data = urllib.request.urlopen(req, timeout=100)
        data = data.read()
        fobj = open("E:/元气壁纸缓存/img\\" + str(count) + ext, "wb")
        fobj.write(data)
        fobj.close()
        print("downloaded" + str(count) + ext)
    except Exception as err:
        print(err)


start_url 
headers = {"User-Agent": "Mozilla/5.0(Windows;U;Windows NT 6.0 x64;en-US;rv:1.9pre)"
                         "Gecko/2008072421 Minefield/3.0.2pre"}
count = 0
threads = []
imageSpider(start_url)
for t in threads:
    t.join()
    print("The End")

控制台运行结果： 

爬取到的图片如下：（可将代码里面路径更改自己电脑的位置）