Installation structure of rear auxiliary frame

The invention discloses an installation structure of a rear auxiliary frame. The installation structure of the rear auxiliary frame comprises the rear auxiliary frame and a vehicle body longitudinal beam, wherein four corners of the rear auxiliary frame are fixedly installed on the vehicle body longitudinal beam through threaded fasteners, the left corner and the right corner of the front end of the rear auxiliary frame are connected with the vehicle body longitudinal beam respectively through studs, the left corner and the righter corner of the rear end of the rear auxiliary frame are respectively provided with three installation holes, and the two corners of the rear end of the rear auxiliary frame and the vehicle body longitudinal beam are fixed together through six bolts and the installation holes. The installation structure of the rear auxiliary frame can improve the installation positioning accuracy and installation structure strength of the rear auxiliary frame, can effectively bear sideways load, and is convenient to detach, install and repair.