The invention discloses a novel converse running preventing square speed bump which comprises a base. A groove, motor installation grooves and access openings are formed in the base. A protruding block is arranged on the top outer wall of the base. The inner walls of the installation grooves are in threaded connection with motors. Output shafts of the motors are connected with transmission shafts,and the other ends, penetrating through bearing holes, of the transmission shafts are sleeved with braking gears. The braking gears are in engaged connection with racks. The outer walls of the ends,near the groove, of the racks are in threaded connection with movable boards. The movable boards are in sliding connection with the top outer wall of the base. The inner walls of threaded grooves arein threaded connection with two top boards. The top outer wall, away from the groove, of one top board is in threaded connection with a speed bump body. A clamping groove is formed in the middle lineposition of the bottom outer wall of the speed bump body. A pressure sensor is clamped in the clamping groove. By the adoption of the novel converse running preventing square speed bump, a vehicle converse running preventing effect is achieved, the core component of converse running prevention is the groove, compared with a barb type converse running preventing component, the converse running preventing square speed bump can further guarantee vehicle safety, equipment is installed and overhauled conveniently, and practicability is high.