Self-discharging semitrailer capable of avoiding discharging residues

The utility model discloses a self-unloading semitrailer capable of avoiding unloading residue, which comprises a semitrailer body, a telescopic air cylinder is hinged on one side of the top end of the semitrailer body, a carriage is hinged on the top end of the telescopic air cylinder, electric slide rails are arranged on two sides of the top end of the carriage, connecting rods are arranged at the bottom ends of the electric slide rails, and the connecting rods are connected with the telescopic air cylinder. And a cleaning brush is mounted on the outer side wall of the connecting rod. The cleaning mechanism is arranged on the inner side wall of the carriage, and after the carriage inclines to pour out materials in the carriage, if a worker finds that some residues exist on the inner side wall of the carriage, the electric sliding rail can be started to drive the connecting rod to move left and right on the inner side wall of the carriage to clean the inner side wall of the carriage. The self-discharging sem