The utility model relates to a four-point pre-tightening type safety belt control system which comprises a detection module, an electronic control unit, a left shoulder safety belt module, a right shoulder safety belt module, a left waist safety belt module, a right waist safety belt module and a four-point type adjuster. Each gas generation device comprises a shell, a piston and a pair of racks;each retractor comprises a reel, a coil spring and a pair of gears; one end of each of the left shoulder braid, the right shoulder braid, the left waist braid and the right waist braid is detachably connected with the four-point regulator through a spring bolt; the detection module transmits a detected signal to the electronic control unit, the electronic control unit drives the mechanical controlmodule in the corresponding direction to work according to the received signal, and the mechanical control module drives the corresponding plug pin to be away from the rack, so that the gas generation device generates driving force and drives the corresponding retractor to rotate to drive the corresponding braid to contract. The automobile safety belt tightening device can detect the state of anautomobile and control tightening of the safety belt in the corresponding direction according to automobile collision and inclination information, and therefore passengers are protected.