OTA upgrading method and system of platform-based information entertainment system

The invention discloses a platform-based OTA upgrading method and system for an infotainment system, and relates to the technical field of vehicle infotainment systems, and the method comprises the steps: constructing the protocol communication between a T-BOX and the infotainment system, and carrying out the data connection through a USB; defining waiting time of mode switching by insisting on a principle that local flashing of the diagnostic instrument is prior to OTA remote flashing; if the whole vehicle is provided with the gateway, judging whether diagnostic instrument equipment is accessed or not and monitoring whether a diagnostic message exists or not within waiting time or not; if no gateway exists, production line off-line flashing is carried out; after an engine is started, the OTA vehicle end assembly reads a module software version number by delaying for a certain time and uploads the module software version number to the OTA cloud end, the cloud end pushes an upgrading task, the MasterOTA inquir