The invention relates to an intelligent centrifugal switch turn-off rotation speed tester, belongs to the technical field of detection, and solves the problems that the conventional tester has low measuring accuracy and is not suitable for on-line factory inspection of a motor. The intelligent centrifugal switch turn-off rotation speed tester comprises a shell, wherein the surface of the shell is provided with an external power interface, a motor power connector and an input and output device; a variable frequency sine wave generator, a signal amplifier and a microprocessor are arranged in the shell; sine wave generated by the variable frequency sine wave generator is amplified by the signal amplifier and then is transmitted to a variable frequency constant low-voltage sine wave power supply of a single-phase motor; the microprocessor controls the variable frequency sine wave generator to continuously increase frequency of the sine wave; when a centrifugal switch is turned off, current which flows by the signal amplifier abruptly changes and is fed back to the microprocessor, and a rotation speed value is displayed through the input and output device. The tester has the advantage of high measuring accuracy and is particularly suitable for the on-line factory inspection of the motor.