Energy-saving efficient flue gas condenser

The invention relates to the field of condensers, in particular to an energy-saving efficient flue gas condenser which comprises an inner pipe, a plurality of division bars are arranged on the outer side wall of the inner pipe in the circumferential direction, and a first arc plate is tightly attached between every two adjacent division bars. The inner pipe, the first arc plate and the two division bars adjacent to the first arc plate form a heat absorption cavity used for allowing cooling water to absorb smoke heat, and the end faces of the first arc plate, the inner pipe and the division bars are arranged in a coplanar mode; one end of the inner pipe is communicated with a water inlet cylinder, the other end of the inner pipe is communicated with a water outlet cylinder, the water inlet cylinder is communicated with a water inlet pipe, through holes for communication are formed in the positions, corresponding to the heat absorption cavities, of the water inlet cylinder, drain valves are arranged in the posi