The invention provides an automatic measurement apparatus of isolation switch mechanical load, and a detection method of the same, and relates to a switch apparatus for power supply or distribution, and especially relates to an apparatus of detecting or reflecting mechanical or electrical fault of an isolation switch and a detection method of the same. The automatic measurement apparatus of isolation switch mechanical load includes a field measurement apparatus and an expert diagnosis system, wherein the field measurement apparatus acquires measurement data of the isolation switch and transmits the measurement data to the expert diagnosis system; the field measurement apparatus includes a singlechip, a torque sensor and an angle generation module; the torque sensor is connected with an interface circuit of the singlechip; the angle generation module calculates and generates a main shaft torque angle signal which simulates an angle counting pulse according to the basic parameters of the isolation switch; and the singlechip determines the sampling cycle according to the main shaft torque angle signal, and measures the torque of main shaft through the torque sensor. For the automatic measurement apparatus of isolation switch mechanical load, the singlechip determines the sampling cycle according to the main shaft torque signal and measures the main shaft torque through the torque sensor; no-sensor detection of the torque angle of the main shaft of the isolation switch can be realized through software simulation; by means of coordination of the torque sensor on the main shaft, nondestructive test of the main shaft torque and automatic monitoring of the mechanical performance of the isolation switch.