In recent years, global climate change is abnormal. Affected by extreme weather, rainstorm disasters, mountain torrents and geological disasters occur frequently, causing irreparable losses to people’s lives and property safety. At present, rainstorm early warning, mountain torrent disaster meteorological early warning and mountain torrent disaster early warning are poorly linked, and the collaborative early warning capability is insufficient. There are problems with short foresight period and incomplete warning mechanism. To solve this problem, this paper takes Zhangqiu District of Jinan City as the research area, combs out the early warning indicators of rainstorm in Zhangqiu District, calculates the early warning indicators of mountain flood disasters in Zhangqiu District, and calculates the meteorological early warning indicators of mountain flood disasters using previous research results. And based on the above work results, a joint warning indicator chart was drawn, and the ideas and methods of joint warning were analyzed, filling the gap in joint warning and providing new methods for early warning work.