Toll collection method of expressway unmanned toll collection robot

The invention relates to the technical field of highway toll collection, in particular to a toll collection method of a highway unmanned toll robot. The unmanned charging robot comprises a card storage device, a collection device, a card reading module, a charging module and an output module, the collection device is connected to the card storage device in an extensible and retractable mode, and the charging method comprises the steps that the collection device extends out relative to the card storage device; placing the pass card of the pass in a collecting device; reading the passing information of the passing card through a card reading module; the charging module calculates the amount to be paid according to the passing information; the output module outputs prompt information of the amount to be paid; wherein after the card reading module successfully reads the pass information of the pass card and before the output module outputs the prompt information of the amount to be paid, the collection device is