The invention provides a rotating speed probe switching and restoration device. The device comprises three rotating speed probes, and the three rotating speed probes are respectively connected to the input end of a probe automatic restoration circuit. The output end of the probe automatic restoration circuit is connected to the input end of a rotating speed proposing device, and the output end of the rotating speed proposing device is connected to the input end of a rotating speed probe undisturbed switching circuit. F/V conversion is carried out in the rotating speed probe undisturbed switching circuit, and obtained voltage signals Va, Vb and Vc are outputted to the input end controlled by a DCS. Dx and Dy output witch contacts controlled by the DCS are connected to the rotating speed probe undisturbed switching circuit, so as to control an IC7 two-channel 4X single-pole single-throw digital control analog switching circuit to carry out signal switching. A frequency signal obtained through V/F conversion is outputted to the input end of a 505 digital controller for rotating speed measurement. The device achieves the uninterrupted no-fluctuation measurement of a rotating speed, and can achieve the automatic restoration of a fault probe on site.