NOVELTY - A sewage treatment device with insulation effect comprises artificial wetland tank (1), water inlet pipe (10-b), aeration device, water outlet unit, and immobilized microorganism plate (5) in which artificial wetland tank comprises gravel layer (2), aerobic immobilized microorganism layer, anaerobic immobilized microorganism layer, steel slag layer (3), and sand layer (6), gravel layer is set with water inlet pipe and water distributing branch tube (13-b), water inlet pipe is passed through wall, and water inlet pipe is installed on liquid valve (11-b) and liquid flow meter (12-b).    USE - A sewage treatment device with insulation effect (claimed).    ADVANTAGE - Device is low cost, immobilizes microorganism, improves sewage treatment effect, and has small floor area.    DETAILED DESCRIPTION - A sewage treatment device with insulation effect comprises artificial wetland tank (1), water inlet pipe (10-b), aeration device, water outlet unit, and immobilized microorganism plate (5) in which artificial wetland tank comprises gravel layer (2), aerobic immobilized microorganism layer, anaerobic immobilized microorganism layer, steel slag layer (3), and sand layer (6), gravel layer is set with water inlet pipe and water distributing branch tube (13-b), water inlet pipe is passed through wall, water inlet pipe is installed on liquid valve (11-b) and liquid flow meter (12-b), aerobic immobilized microorganism layer and anaerobic immobilized microorganism layer are installed on immobilized microorganism plate, aerobic immobilized microorganism layer and anaerobic immobilized microorganism layer are intermediately installed on aerating device comprising aerating pipe (10-a) and aerating branch tube (13-a), aerating pipe is passed through wall, main aerating pipe is installed on gas valve (11-a) and gas flow meter (12-a), steel wire (4) is set between aerobic immobilized microorganism layer and gravel layer, water outlet unit comprises water hole (9), water collecting groove (7), and water collecting groove discharging tube (8), filter head is installed on water hole, water outlet unit is set on end of artificial wetland tank and opposite with water inlet pipe, reinforced concrete structure is used to construct artificial wetland tank, insulating layer (16) is installed inside of tank body, cavity is formed on inner wall and steel plate of tank body insulating layer, and insulated cotton is added into cavity.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of sewage treatment device with insulation effect.    Artificial wetland tank (1)    Gravel layer (2)    Steel slag layer (3)    Steel wire (4)    Immobilized microorganism plate (5)    Sand layer (6)    Water collecting groove (7)    Water collecting groove discharging tube (8)    Water hole (9)    Aerating pipe (10-a)    Water inlet pipe (10-b)    Gas valve (11-a)    Liquid valve (11-b)    Gas flow meter (12-a)    Liquid flow meter (12-b)    Aerating branch tube (13-a)    Water distributing branch tube (13-b)    Insulating layer (16)