The invention discloses a vehicle-mounted road surface crack detection system inspection device based on a worm and gear, and aims at solving the problem that it is achieved that a vehicle-mounted road surface crack detection system inspects crack measurement results with different scales by adopting worm and gear transmission. The vehicle-mounted road surface crack detection system inspection device based on the worm and gear is mainly composed of a worn (1), a worm supporting seat (2), a hand shank (3), a worm wheel rotating table (4), a supporting shaft (5) and a supporting shaft base (6).The system provides the vehicle-mounted road surface crack detection system inspection device based on the worm and gear which has the advantages that the crack scales are different, the device structure is simple, the performance is reliable, the operation and installation are simple and convenient, and the cost is lower.