Highway vehicle toll collection method and system based on ramp free flow, and storage medium

The invention discloses a highway vehicle toll collection method and system based on ramp free flow. The method is executed by a highway vehicle toll collection system based on ramp free flow, and thetoll collection system comprises a pre-transaction platform and a square toll lane device, the method comprises the following steps: after a vehicle enters a ramp and before the vehicle runs to a toll square lane, the pre-trading platform detects whether a passing vehicle is installed with a special highway vehicle-mounted device or not, wherein the lane is a lane supporting the pre-trading function; and if the pre-transaction platform detects that the vehicle is installed with the special highway vehicle-mounted device, the vehicle is subjected to the pre-transaction, the pre-transaction record is generated and is stored in the pre-transaction platform; and the square toll lane device is subjected to direct releasing of the vehicle completed the pre-transaction at the toll station according to the pre-transactio