ETC invoice automatic issuing method and device

The invention provides an ETC invoice automatic issuing method and device, and the method comprises the steps: obtaining induction information of a roadside unit erected on a roadside, generating a first query code of a vehicle-mounted electronic tag and the roadside unit erected on the roadside, generating first travel information through an ETC mobile phone terminal according to the induction information of the roadside unit erected on the roadside, and generating a second query code through a preset encryption algorithm; and enabling the ETC platform to analyze the second query code and then match a corresponding first query code, generating second travel information and cost information, and generating a corresponding electronic invoice; and obtaining the downloading link of the electronic invoice so as to issue the invoice. According to the invention, the information of the vehicle-mounted electronic tag, the ETC mobile phone terminal and the ETC platform is associated, and the PDF file downloading link