Vehicle gray scale upgrading method and system

The invention provides a vehicle gray scale upgrading method and system, and belongs to the field of vehicle upgrade.The method comprises the steps that a to-be-upgraded vehicle is determined; according to a preset vehicle selection strategy, determining a vehicle with a preset proportion from the to-be-upgraded vehicles, and recording the vehicle as a test vehicle; the preset vehicle selection strategy comprises at least one of the following: selecting vehicles of which the online rate is greater than or equal to an online rate threshold value, selecting vehicles of which the activeness is greater than or equal to an activeness threshold value, selecting vehicles of high-configuration vehicle types, and selecting vehicles of which the time period from the factory date to the current date is within a time period threshold value; upgrading the test vehicle; and when the test vehicle is successfully upgraded and the running is not abnormal in the first preset time period, upgrading the remaining vehicles in the