The utility model discloses a double-tower two-stage CO2 adsorption and capture system with a heat recovery device and relates to a CO2 adsorption and capture system. The system can solve the problems of high temperature and low-concentration CO2 of existing flue gas. A high-temperature flue gas pipe is communicated with one end of a normal-temperature flue gas pipe through a heat exchanger, the normal-temperature flue gas pipe is respectively communicated with a third valve and a valve III, the third valve is communicated with a flue gas inlet of a first tower, and the valve III is communicated with the flue gas inlet of a second tower; the inlet end of a seventh valve at a buffering gas outlet is communicated, the outlet end of the seventh valve is respectively communicated with a second valve through a valve II, the valve II is communicated with the flue gas inlet of the second tower, and the second valve is communicated with the flue gas inlet of the first tower; a second gas outlet of a buffer tank is communicated with a gas inlet of a ninth valve, a gas outlet of the ninth valve is respectively communicated with the ninth valve and a valve IX, the ninth valve is communicated with the gas inlet of a third tower, and the valve IX is communicated with the gas inlet of a fourth tower. The double-tower two-stage CO2 adsorption and capture system disclosed by the utility model is used for adsorption and capture of CO2.