The utility model provides a carbon dioxide capture and purification device. The carbon dioxide capture and purification device comprises an absorption tower, a heat exchange partition regeneration tower, a heat pump set, a heat exchanger, a reboiling tower, a flash evaporator and an air blower, wherein exhaust gas in a coal-fired power plant is connected with an inlet of the heat pump set, the heat pump set is connected with the bottom of the absorption tower through the air blower, a liquid outlet of the heat pump set is connected with an inlet of the heat exchanger through a liquid pump, and an outlet of the heat exchanger is connected with a reflux inlet of the heat pump set; a rich liquid bottom outlet of the absorption tower is connected with a heated liquid inlet of the heat exchanger, a heated liquid outlet is connected with a rich liquid inlet in the interlayer of the middle of the heat exchange partition regeneration tower through a control valve, a barren liquid outlet in the bottom of the heat exchange partition regeneration tower is connected with the reboiling tower, a lithium bromide recovery device and a barren liquid inlet of the liquid pump in parallel through control valves, a barren liquid outlet of the reboiling tower is connected with a barrel liquid inlet in the bottom of the heat exchange partition regeneration tower, a rich liquid outlet in the top of the heat exchange partition regeneration tower is connected with a rich liquid inlet of a cooler, and a rich liquid outlet of the cooler is connected with a rich liquid inlet of the flash evaporator, and CO2 products flashed off by the flash evaporator are output.