Street sweeper automobile body steering mechanism. The utility model provides a simple structure, the convenient connection, the street sweeper automobile body steering mechanism of flexible operation. Including preceding frame, back frame and hinged girder, be equipped with a pair of baffle no. 1 and a pair of baffle no. 2 on the opposite face of preceding frame and back frame respectively, the one end of hinged girder is connected at a pair of baffle between, and the other end is connected and is in a pair of baffle is between two, the hinged girder passes through bolted connection with a pair of baffle no. 1, a pair of baffle no. 2 respectively. The utility model discloses at work, the hinged girder is connected between the frame to preceding frame and back, the hinged girder respectively with preceding frame on a pair of baffle no. 1, a pair of baffle no. 2 of back frame pass through bolted connection, set up joint bearing connecting bolt in the hinged girder for preceding, back frame can be crooked, hinged girder and a pair of baffle no. 1, a pair of baffle are equipped with the clearance respectively between two, before allowwing, the frame distortion of back, and the different operational environment of adaptation.