The invention discloses an end cap of a ball valve, and relates to the technical field of ball valve port sealing. The end cap of the ball valve at least comprises a driving plate, a pushing and pressing plate and a sealing cap, wherein the pushing and pressing plate is positioned between the driving plate and the sealing cap, the driving plate is fixedly connected with the pushing and pressing plate through a plurality of connecting rods, and the pushing and pressing plate is elastically connected with the sealing cap through a plurality of first springs. The end cap of the ball valve aims tosolve the problem that ball valve deformation influences the test results caused by the fact that when an existing ball valve leak detecting device is tested, the two ends of the ball valve are pressed, and the sealing end cap of the ball valve enables the two ends of the ball valve to be not subjected to axial force and improves the test precision.