The invention discloses a suction type concrete mixing device. The suction type concrete mixing device comprises a rack, a mixing tank and a motor. The mixing tank is in a barrel shape. A gear ring which surrounds the barrel of the mixing tank by one circle is arranged on the mixing tank. A gear which is matched with the gear ring is arranged at the end of a motor shaft of the motor. A feeding port is formed in one end of the mixing tank, a discharging port is formed in the other end of the mixing tank, and a feeding device is arranged at the discharging port of the mixing tank. The feeding device comprises a hopper and a second rolling wheel, wherein the hopper is fixedly connected with the second rolling wheel, and the second rolling wheel is movably connected with the mixing tank. A dust collector is arranged at the end opening of the hopper. The dust collector comprises an air suction ring, an air pump and a dust collection box, wherein the air suction ring is arranged around the circumference of the end opening of the hopper, and the air pump communicates with the air suction ring and the dust collection box. Threads are arranged on the portion, at the feeding port, of the inner wall of the mixing tank. The suction type concrete mixing device has the beneficial effects that the threads are arranged at the feeding port of the mixing tank, inward suction force is generated after rotation, and thus materials are prevented from being blocked at the feeding port.