NOVELTY - Dual thermal energy temperature increasing fermenter, comprises a fermenter (1) and a solar temperature increasing device (2). The fermenter comprises a tank body (10), whose top is provided with a gas film (9). The gas film comprises an inner film (91) and an outer film (92). The inner part of the gas film is connected to an air pipeline. An air outlet port connected to a biogas pipe is set on the sidewall of the tank body at a position between the inner film and a liquid-level discharge height line. The lower part of the liquid-level discharge height line is provided with an overflow port.    USE - Used as a dual thermal energy temperature increasing fermenter.    ADVANTAGE - The fermenter: has high temperature increasing efficiency, energy saving performance and environmental protection performance; is economical and suitable for large-scale biogas plant.    DETAILED DESCRIPTION - Dual thermal energy temperature increasing fermenter, comprises a fermenter (1) and a solar temperature increasing device (2). The fermenter comprises a tank body (10), whose top is provided with a gas film (9). The gas film comprises an inner film (91) and an outer film (92). The inner part of the gas film is connected to an air pipeline. An air outlet port connected to a biogas pipe is set on the sidewall of the tank body at a position between the inner film and a liquid-level discharge height line. The lower part of the liquid-level discharge height line is provided with an overflow port. The overflow port is connected to a hydraulic packer by an overflow pipe. The dual thermal energy temperature increasing fermenter further comprises an assisted thermal temperature-increasing device. The assisted thermal temperature-increasing device and the solar temperature-increasing device are arc shaped structures. The solar temperature-increasing device is set around the south sidewall of the tank body. The assisted thermal temperature-increasing device is set around the north sidewall of the tank body. The upper parts of the assisted thermal temperature-increasing device and the solar temperature-increasing device are provided with platforms. The solar temperature increasing device, the assisted thermal temperature-increasing device, the platforms, the ground, and the sidewall of the tank body together form a sealed structure. The color of the sidewall of the tank body is black.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the dual thermal energy temperature increasing fermenter.    Fermenter (1)    Solar temperature increasing device (2)    Gas film (9)    Tank body (10)    Inner film (91)