Vehicle-mounted positioning method and system

The invention discloses a vehicle-mounted positioning method and system, and relates to the technical field of vehicle-mounted positioning. The method comprises the following steps: acquiring corresponding initial vehicle positioning and vehicle driving data when a current vehicle is driven; based on the initial vehicle positioning, determining a plurality of current environment factors influencing the vehicle-mounted positioning precision, and determining current environment data corresponding to each current environment factor; based on the vehicle driving data and the multiple pieces of current environment data, obtaining an environment influence coefficient; when the environmental influence coefficient is greater than a preset influence threshold value, determining a corrected reference point on the current road based on the vehicle driving data; and correcting the initial vehicle positioning based on the reference point positioning corresponding to the corrected reference point to obtain the corrected ve