The invention discloses an automobile automatic transmission P-gear parking critical entry car speed test measuring system. The automobile automatic transmission P-gear parking critical entry car speed test measuring system comprises a mechanical system and a measure and control system; the mechanical system comprises an iron foundation, a to-be-tested automatic transmission, a torque rotation speed sensor, a driving motor, a gear shifter, a gear shifting pull cable, a transmission installation base frame, a half shaft, a half shaft connecting disc, a sensor base, a coupler, a motor base and a gear shifter base; the measure and control system comprises a computer, a motor controller and a data collector. By adopting the automobile automatic transmission P-gear parking critical entry car speed test measuring system, a P-gear parking entry car speed can be accurately measured under an analog automatic transmission car test working condition, so that the test reliability and the test accuracy of the automatic transmission P-gear parking critical entry car speed can be improved.