Mouse trapping device for dam

The mouse trapping device for the dam comprises a mouse trapping box with an opening in the upper end, a supporting plate is hinged to the inner side wall of the upper end of the mouse trapping box, a reset spring is connected between the lower side wall of the supporting plate and the inner side wall of the mouse trapping box, and the inner side wall of the mouse trapping box is further connected with a fixing block opposite to the supporting plate. A trapping area is arranged on the upper side wall of the end, close to the fixing block, of the supporting plate, a cavity is fixedly formed in the inner side wall of the mouse trapping box, the cavity is located under the fixing block, a piston is arranged in the cavity in an up-down sliding mode, a pressing rod is connected to the upper side wall of the piston, and the upper end of the pressing rod penetrates through the top wall in the cavity in a sliding mode and is connected with a limiting plate; the lower side wall of the free end of the supporting plate