The utility model discloses an integrated installation structure of a controller for an engine, which comprises a rectifier bridge installation frame, a first installation pin, a second installation pin and a controller installation structure which are integrally formed in a die-casting mode, the rectifier bridge installation frame is arranged above the controller installation structure, and the first installation pin and the second installation pin are arranged on two sides of the rectifier bridge installation frame. The beneficial effects of the utility model are that the rectifier bridge isfixed on the rectifier bridge installation rack in advance before use, and the PCB is also installed in advance. When the fixing structure is used, the fixing structure is installed in an integratedstructure, and the fixing structure can be fixed to the electric vehicle only by enabling two screws to penetrate through the first installation foot and the second installation foot respectively. Anoriginal support installation method is replaced by the installation foot structure, an upper installation support and a lower installation support for installing the rectifier bridge and the controller are omitted, installation cost and material cost are saved, and work efficiency is improved by 3-4 times.