NOVELTY - Movable constant temperature marsh gas generator comprises a (a) a pond wall of a marsh gas generator, (b)a high intensity polyvinyl chloride radiating tube, where one end of the tube is connected with a solar heat collector and the other end is wrapped on the underground marsh gas generator for several circles; (c) a radiating tube, which is spirally attached on the pond wall of the marsh gas generator; (d) a feed port; (e) a gas pressure meter; (f) a first pressure sensor and a second pressure sensor, which are arranged on inner upper part of the marsh gas generator.    USE - The device is useful as marsh gas generator.    ADVANTAGE - The device is movable, convenient to mount, suitable for most rural families, enterprises and public institutions for production and life.    DETAILED DESCRIPTION - Movable constant temperature marsh gas generator, comprises (a) a pond wall of a marsh gas generator, where the outer wall is covered with polyurethane heat insulating material, the inner and outer walls of the marsh gas generator are coated with polyurea elastic material of waterproof anticorrosive coating layer; (b) a high intensity polyvinyl chloride radiating tube, where one end of the tube is connected with a solar heat collector and the other end is wrapped on the underground marsh gas generator for several circles and then it extends out of the ground to be connected with the water return tube of the solar heat collector; (c) a radiating tube, which is spirally attached on the pond wall of the marsh gas generator, 1/3 of diameter of the radiating tube is placed in the polyurethane layer and the rest 2/3 is placed outside the polyurethane layer, polyurethane inner wall and the radiating tube are stuck by a coating layer to prevent the radiating tube shedding; (d) a feed port, which is arranged on upper cover of the marsh gas generator, the discharge port is arranged on one side at the bottom of the marsh gas generator and is extended with a discharging tube, one end of the discharging tube is connected with a slurry pump at bottom of the marsh gas generator and the other end of the discharging tube raises to ground to form a discharge port; (e) a gas pressure meter, which is arranged on an air outlet tube at upper part of the marsh gas generator cover; (f) a first pressure sensor and a second pressure sensor, which are arranged on inner upper part of the marsh gas generator.