1.打开settings.py，查看：

STATIC_PATH=APP_PATH+'/staticmedia'
STATIC_ROOT = STATIC_PATH
STATIC_URL = '/pagemedia/'

2.查看ADMIN_MEDIA_PREFIX

ADMIN_MEDIA_PREFIX = '/media/'

3.修改ADMIN_MEDIA_PREFIX

ADMIN_MEDIA_PREFIX = '/pagemedia/admin'

ok，问题解决！