The invention provides a friction wheel which comprises a gear motor, a shell, an air spring, a wheel body, a fixed supporting plate, a rotary shaft, a transmission shaft and a rack. The rack is arranged in the shell, a support of the transmission shaft is arranged on the rack, the transmission shaft is arranged in the support of the transmission shaft, the gear motor is arranged on one side of the support of the transmission shaft, a rotating shaft of the gear motor is meshed with the transmission shaft, the wheel body is fixedly arranged at one end of the transmission shaft through a pressing plate, a pair of rotary lug plates is arranged on one side of the gear motor, the two ends of the rotary shaft are arranged in through holes of the corresponding rotary lug plates, and the air spring is arranged at the bottom of the support of the transmission shaft. According to the friction wheel, a mold frame for aerated concrete bricks can automatically walk through the air spring and the wheel body, a plurality of friction wheels can be combined for used, the friction wheel is extremely convenient to use, and damage to the mold frame can be greatly reduced through the air spring.