Calibrating device for automatic tire pattern depth measuring instrument

The invention belongs to the technical field of tire measuring devices, and discloses a tire pattern depth automatic measuring instrument calibration device which comprises a base frame used for being arranged on the surface of a to-be-calibrated tire pattern depth automatic measuring instrument; the calibration device body is used for being arranged above the automatic tire pattern depth measuring instrument, and at least one pattern depth standard groove is formed in the surface of a tire crown of the calibration device body; the driving mechanism is used for driving the calibration device body to roll along the base frame; and the encoder is connected with the calibration device body and is used for acquiring the rotating speed and the forward linear speed of the calibration device body. The driving mechanism drives the calibration device body to roll along the base frame, the encoder reads the rotating speed and the advancing linear speed of the calibration device body, the pattern depth standard value co