Vehicle multi-controller flashing device

According to the technical scheme, the vehicle multi-controller flashing device comprises a first controller and a second controller; the first controller is used for communicating with the cloud server and a plurality of vehicle controllers in the same vehicle, downloading a to-be-updated program of the vehicle controller from the cloud server, and acquiring a vehicle VIN code and information of each controller of the vehicle by the first controller through the vehicle controller to complete priority numbering and address allocation and diagnosis of each vehicle controller; the second controller is used for communicating with the first controller and a plurality of vehicle controllers in the same vehicle; and the second controller receives and stores the to-be-updated program downloaded by the first controller, and writes each vehicle controller according to the priority number and address of each vehicle controller and the diagnosis result. The controller flashing time is greatly shortened, and the whole ve