Carbon dioxide trapping device

The invention provides a carbon dioxide trapping device, which comprises: an absorption tower having a gas inlet, a gas outlet, an absorption liquid inlet and an absorption liquid outlet; the heat exchanger is provided with a flue gas inlet, a flue gas outlet and a condensation outlet which are communicated, and the flue gas outlet is communicated with the gas inlet; the cooling assembly comprises a condensation water tank and a cooling pipe, the cooling pipe penetrates into the absorption tower from the outside of the absorption tower and penetrates out of the absorption tower, the condensation water tank is provided with a condensation inlet, a water outlet and a first water return port, the condensation outlet is communicated with the condensation inlet, the cooling pipe is provided with a cooling inlet and a cooling outlet, and the water outlet is communicated with the cooling inlet; the cooling outlet is communicated with the first water return port. According to the technical scheme provided by the inve