The vehicle-mounted laser methane leakage detection system is a specialized equipment used for quickly and extensively detecting natural gas pipeline leaks such as buried pipelines and overhead pipelines. Through the laser detector installed on the top of the motor vehicle continuously scanning the gas within a radius of up to 150 meters, the information measured by the vehicle-mounted methane analysis device is analyzed, processed, displayed, saved and recorded by the operation software, and the relevant images and GPS data are marked on the map.