The invention belongs to the technical field of bearing detection and relates to a device for testing the pressure borne by a taper-hole bearing sealing ring. The device comprises a taper-hole pressure chamber wall, a compression nut, a bearing sealing ring, a scale screw, a push nut, a helical casing, a taper-hole pressure chamber, a sealing ring, a pressure gauge, and an external pressure air duct. The scale screw is disposed in the taper-hole pressure chamber. The nut of the scale screw and the compression nut fix one end of the scale screw to the taper-hole pressure chamber wall. The bearing sealing ring is installed on the other end of the scale screw. The helical casing and the push nut are installed on the left end and the right end of the bearing sealing ring respectively. A sealing ring is arranged between the scale screw and the taper-hole pressure chamber wall. The external pressure air duct and the pressure gauge are installed on the taper-hole pressure chamber wall. The taper-hole pressure chamber is a high-precision taper hole. The device is simple in structure, easy to operate, and accurate in testing results, and may test the pressure borne by the bearing sealing rings with different internal diameters just by using the helical casings with different specifications.