The invention discloses a sealing structure for the top end of a rotor engine, and belongs to the technical field of rotor engines. The sealing structure comprises a rotor, an air cylinder, a front end cover and a rear end cover, and further comprises sealing plates and spring sets; each sealing plate is of a combined type sealing structure, and is formed by lapping two sealing plates; the right angle positions of the small end face of each sealing plate are all rounded off; grooves used for being matched with corresponding spring strips are formed in each sealing plate, and each sealing platehas a butting end face used for abutting with a corresponding compression spring; and each spring set is used for providing a combined spring force of the radial direction and the axial direction forthe corresponding sealing plate, and consists of an outer spring strip, an inner spring strip and a compression spring. When the rotor rotates, every two sealing plates are squeezed to the profile ofthe air cylinder under the joint action of a centrifugal force, the elastic force of the corresponding spring set and gas pressure, and thereby, partitioned sealing of adjacent combustion chambers isrealized; and the sealing structure not only is capable of guaranteeing good sealing performance of the top end of the rotor engine but also is capable of reducing scratches of the profile of the aircylinder and the end faces of the cylinder covers, and then, the service life of the rotor engine is prolonged.