The invention discloses a square steel treatment auxiliary device. The square steel treatment auxiliary device comprises a base, a
machining assembly and a dust falling and cooling
assembly are arranged at the upper end of the base, the
machining assembly comprises a bearing plate, a door-shaped installing frame, a connecting rod, a mouth-shaped installing frame, a rotating motor, a cutter, a door-shaped protective shell, a water box and a
precipitation tank, wherein the dust falling and cooling assembly comprises a
water storage tank, a second water pump and a third water pump, the water inlet end and the output end of the second water pump communicate with the
water storage tank and a first
water supply pipe correspondingly, the end, away from the second water pump, of the first
water supply pipe penetrates through the door-shaped protective shell and the door-shaped installing frame to be connected to a liquid spraying head, the water inlet end and the output end of the third water pump communicate with the
water storage tank and a second
water supply pipe correspondingly, the end, away from the third water pump, of the second water supply pipe is connected to the water box, and multiple sprayers are arranged at the lower end of the water box. According to the square steel treatment auxiliary device, by arranging the liquid spraying head and the sprayers, a cutter can be cooled, and dust generated during
cutting can be adsorbed, so that cooling and dust removing functions of the device are achieved.