Variable valve timing system control method and device, vehicle and readable storage medium

The invention provides a variable valve timing system control method and device, a vehicle and a readable storage medium, the method is used for controlling a variable valve timing system of a Miller cycle engine, and the method comprises the steps that the temperature after intercooling is obtained; the temperature after intercooling is the temperature of the air after passing through an intercooler of the Miller cycle engine; if the temperature after intercooling is larger than the preset temperature, the variable valve timing system is controlled based on a pre-calibrated first VVTmap; if the temperature after intercooling is not larger than the preset temperature, the variable valve timing system is controlled based on a pre-calibrated second VVTmap; the effective compression ratio corresponding to the first VVTmap is smaller than the effective compression ratio corresponding to the second VVTmap. According to the method, the defect of abnormal combustion at the temperature after high and medium cooling o