Sewage treatment device

The invention discloses a sewage treatment device, belonging to the field of sewage purification. The sewage treatment device comprises a support frame, an adsorption reaction tank A, a security filter, an adsorption reaction tank B, an activated carbon canister and a water outlet tank, wherein the inner bottom side of the support frame is provided with a water inlet screw pump, the inner top side of the support frame is provided with a backwashing water pump, and the security filter, the adsorption reaction tank A, the adsorption reaction tank B, the activated carbon tank and the water outlet tank communicate with one another from one end to the other end through water conveying pipes. According to the invention, harmful substances in water can be adsorbed by using hollow microspheres, and an adsorption material can be repeatedly utilized, so water treatment cost is reduced; a filter element is fixed by adopting a top clamping mode, and the filter element can be replaced without being disassembled, so operat