NOVELTY - A biogas production system comprises biogas tank (1) and connecting pipe (2) in which biogas tank comprises biogas production tank body and tank cover hinged to upper part of tank body, tank body contains electric heating tube (3) and electric heating tube control device, end of connecting pipe passes through tank cover and is connected to tank body, other end of connecting pipe is connected to storage device, storage device comprises pedestal (4) and gas storage bag (5) containing set of gas cavities, and pipe is connected to gas cavity.    USE - A biogas production system (claimed).    ADVANTAGE - Biogas production system is low-cost and easy to manufacture and carry and has high efficiency, small floor space, good sealing performance, and improved biogas yield.    DETAILED DESCRIPTION - A biogas production system comprises biogas tank (1) and connecting pipe (2) in which biogas tank comprises biogas production tank body and tank cover hinged to upper part of tank body, tank body contains electric heating tube (3) and electric heating tube control device, end of connecting pipe passes through tank cover and is connected to tank body, other end of connecting pipe is connected to storage device, storage device comprises pedestal (4) and gas storage bag (5) containing set of gas cavities, pipe is connected to gas cavity, pipeline structure between set of pipes connect gas cavities in series, upright post (6) is fixed on vertical axis of pedestal and contains pressure holding mechanism, gas storage bag contains mounting hole, each gas storage bag contains ring-shaped 1st bag body and 2nd bag body, pipeline structure comprises set of connection valves and main pipe (9), bearing housing (10) is fixed on pedestal, pressure holding mechanism comprises pressure plate (11), spring (12), and nut (13), pressing plate contains lifting hole, spring has compressed state, control device comprises 2nd PLC programmable controller (18) and temperature sensor (19), upper part of upright post is connected to driving mechanism, and driving mechanism comprises driving gear, driven gear, chain, and motor, 1st programmable logic controller (PLC) programmable controller (17) is fixed to pedestal, and tank cover contains mounting holes.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of biogas production system.    Biogas tank (1)    Connecting pipe (2)    Electric heating tube (3)    Pedestal (4)    Gas storage bag (5)    Upright post (6)    Main pipe (9)    Bearing housing (10)    Pressure plate (11)    Spring (12)    Nut (13)    1st PLC programmable controller (17)    2nd PLC programmable controller (18)    Temperature sensor (19)