Fuel gas treatment energy-saving heating system

The utility model relates to the technical field of waste heat recycling, in particular to a gas treatment energy-saving heating system which comprises an engine, a heat exchanger and a cooler, a fuel gas channel is arranged in the heat exchanger, a jacket water flow channel is arranged in the engine, and a water outlet of the jacket water flow channel is connected with a water inlet of the heat exchanger. A water inlet of the jacket water flow channel is connected with a water outlet of the cooler; a water outlet of the heat exchanger is connected with a water inlet of the cooler; the device further comprises a membrane separator, an air inlet and an air outlet are formed in the heat exchanger, and the air outlet of the heat exchanger is connected with the air inlet of the membrane separator. Heat exchange between jacket water of the engine and fuel gas circulating in the heat exchanger is achieved, waste heat of a cooling water system of the engine is effectively utilized, the comprehensive utilization rate