Non-standard function implementation method and device based on vehicle-mounted application system

The invention discloses a non-standard function implementation method and device based on a vehicle-mounted application system, relates to the technical field of railways and computers, and mainly aims to solve the problem that when the same non-standard function is reproduced on each level of vehicle-mounted equipment, repeated development needs to be carried out in each environment. According to the main technical scheme, the method comprises the following steps: detecting whether a specified code module capable of realizing a target non-standard function exists in a business customization layer according to information of the target non-standard function in a train operation demand; if the specified code module exists, pulling the specified code module, and pulling a standard code module corresponding to a standard function in the target vehicle-mounted equipment in an application service layer and a general service layer according to target level information in the train operation demand; and the codes in