The invention discloses an atomization tank of atmospheric particulate sampling filter membrane cleaning equipment having a heat preservation function. The atomization tank is connected after a liquidstorage tank and a cleaning tank; the atomization tank is divided into an upper part and a lower part; the lower part is a cylindrical structure; the upper part is a cone structure; furthermore, theentrance of the atomization tank is on the lower side surface of the lower part; the exit of the atomization tank is on the top end face of the upper part; a universal joint and a heat preservation pipe are also included; the exit is connected with the heat preservation pipe through the universal joint; the heat preservation pipe is a circular pipe structure; furthermore, a heating wire is arranged therein; and the tail end of the heat preservation pipe is connected with an external large experimental apparatus. The invention discloses the atomization tank of the atmospheric particulate sampling filter membrane cleaning equipment having the heat preservation function, which is simple in structure, low in cost and good in atomization effect.