Vehicle monitoring sensor and vehicle monitoring system

The utility model provides a vehicle monitoring sensor and a vehicle monitoring system, and the sensor comprises a housing, one side of which is provided with a wiring harness connector; the sound transmission hole is formed in one surface of the shell and penetrates through the shell; the circuit board assembly is installed in the shell, an audio monitoring module, a vibration sensing module and a bus module are arranged on the circuit board assembly, and the audio monitoring module and the vibration sensing module are in communication connection with the bus module. According to the utility model, the audio monitoring module, the vibration sensing module and the bus module are integrated on the circuit board assembly, so that a vehicle can be monitored when being parked, and audio evidence is collected after collision; man-machine interaction can be carried out in a knocking mode or a voice instruction; audio signals collected in the driving process can be used for assisting an ADAS or an active safety syst