Main shaft torque loading device for acceleration reliability test and measurement method thereof

The invention discloses a main shaft torque loading device for an acceleration reliability test and a measuring method thereof, the main shaft torque loading device comprises a U-shaped frame assembly, an eddy current brake and a planetary reducer, the eddy current brake is installed at one end of the U-shaped frame assembly through cooperation of a screw and a brake installation transition disc, and one side of a left connecting shaft is partially inserted into the eddy current brake; the planetary reducer is fixed to the other end of the U-shaped frame assembly in cooperation with a reducer installation transition disc through a screw, one side of the planetary reducer is connected with a right connecting shaft, the left connecting shaft and the right connecting shaft are connected together, a torque sensor support is arranged on the upper portion in the U-shaped frame assembly, and a rotating speed sensor and a torque sensor are arranged on the torque sensor support. The left connecting shaft is sleeved wi