High-precision torque measuring device of hydrostatic bearing

The utility model relates to a torque measuring device of a hydrostatic bearing, consisting of a fixing part (1) and a floating part (2). The floating part (2) is fixedly connected with a measured rotary component (3); simultaneously, the floating part (2) is connected with a high-precision force sensor (5) through a hydrostatic bearing force arm (4); the fixing part (1) is arranged under the floating part (2); the device further comprises a high-pressure oil supply system, wherein the high-pressure oil supply system can supply high-pressure oil to a combining part of the fixing part (1) and the floating part (2); a high-pressure oil film is formed at the combining part of the fixing part (1) and the floating part (2). Using low friction coefficients and high sensitivity property of the high-pressure oil supplied by the high-pressure oil supply system, a torque affected by the rotary component on the bearing is transmitted to the high-precision force sensor through the force arm so as to realize an original position calibration and accurately reflect the torque property index of the to-be-measured rotary component.