The invention discloses a sealing device between a flue gas recirculation cover and a trolley of a sintering machine. The sealing device comprises the trolley, and breast boards are arranged on the two sides of the trolley. The sealing device is characterized in that lower sealing supporting boards are arranged on the outer sides of the breast boards; folding edges are arranged on the outer sides of the lower sealing supporting boards and are perpendicular to the horizontal plane; the length direction of the folding edges is parallel to that of the breast boards; inner baffles are arranged on the sides, close to the breast boards, of the folding edges, and outer baffles are arranged on the sides, far away from the breast boards, of the folding edges; the tops of the inner baffles and the tops of the outer baffles are connected with a connecting plate; and the connecting plate is connected with the flue gas recirculation cover of the sintering machine through a connecting piece. The service life is long, the sealing structure can be replaced without shutdown, the air leakage rate of the part between the trolley and the flue gas recirculation cover can be lowered to be below 10%, and the energy saving and emission reducing effect of the sintering process is guaranteed; and along with sintering production, the sealing effect is gradually enhanced on the original basis, and long-term continuous and stable running of the sintering process can be guaranteed.