The utility model discloses a semitrailer of automatic device of getting in stocks is equipped with, the semitrailer includes trailer board, folding side shield, conveyor, row's goods device, hides rain device and discharge devices, is equipped with folding side shield in the both sides of trailer board, and trailer board upper surface is equipped with the horizontally slide rail, installs the row's goods device that can arrange goods automatically on the horizontal slide rail, conveyor includes accordion conveyor and vertical feed frame, is equipped with the recess respectively at trailer board both sides wall, installs the accordion conveyor in the recess, is equipped with perpendicular conveyor directly over the accordion conveyor, and perpendicular conveyor fixes in row goods device side, is equipped with discharge devices on arranging the goods device, still is equipped with on the trailer board and hides the rain device. The utility model discloses the automatic loading that canrealize little article puts, the human cost of saving.