NOVELTY - Reinforcing and stabilizing methane production by utilizing an air energy heat pump, where the hot water at 50-70 degrees C is produced by the air energy heat pump and fed into a heat exchange with a mechanical scale removal device in a methane tank by a water circulating system; the methane in the methane tank is heated, so that the temperature of the fermentation methane is stabilized in the moderate temperature range for anaerobic digestion, and the methane production is reinforced and stabilized.    USE - The method and device are used for reinforcing and stabilizing methane production (claimed).    ADVANTAGE - By adopting the method and the device above, the temperature of the methane in the methane tank cannot be changed along with the outer environment and can be kept in a moderate temperature range. Methane production method is stable, provides high yield, uses low energy consumption and provides low emission of the methane. The hot medium water is circularly used, and the scaling problem of the heat pipe is solved. The method is energy-saving and environmental-friendly, and can be controlled conveniently. The device has prolonged service life and its heating efficiency is improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is a device for reinforcing and stabilizing methane production by utilizing the air energy heat pump, where the mechanical scale removal device comprises multiple scale removal ring components capable of moving along the surface of a heat exchange pipe, and a power transfer mechanism for driving the scale removal ring component to move; the ring parts on the upper parts of the multiple scale removal ring components of the mechanical scale removal device are respectively sleeved on the parallel heat exchange pipes and have contact friction translation along the outer surface of the scale removal device; the top of each scale removal ring component is fixedly connected with a connecting rod, and the lower end is hinged with the chain and driven to translate by the chain; the power transfer mechanism of the scale removal ring component is driven by a motor; a chain wheel group formed by three chain wheels and a chain is provided, and wheel axes of two driven chain wheels are respectively fixedly connected with two heat medium collection manifolds.