Engine oil-gas separation system icing prevention method and device

The invention belongs to the technical field of oil-gas separation system icing prevention, and relates to an engine oil-gas separation system icing prevention method and device. The method comprises the following steps of S1, arranging a heat preservation wrapping layer matched with an oil-gas separator in shape, and arranging an electric heating assembly on an oil return pipe, wherein the electric heating assembly comprises a temperature control module and a time control module, the temperature control module comprises a temperature sensor and a temperature control switch, and the time control module comprises a timer and a time switch; S2, judging whether an engine is in a starting state or a running stopping state, if the engine is in the starting state, switching on the time switch, acquiring the pipe wall temperature data of the oil return pipe through the temperature sensor, and judging whether the electric heating assembly is started or not according to the obtained pipe wall temperature data of the o