Air heater control method and device, controller, air heater and storage medium

The embodiment of the invention discloses an air heater control method and device, a controller, an air heater and a computer storage medium. When it is detected that the air heater meets the preheating condition, the current outdoor temperature value is obtained; a preheating time initial value and a preheating time compensation coefficient are obtained; the preheating time of the air heater is calculated according to the current outdoor temperature value, the preheating time initial value and the preheating time compensation coefficient; and the air heater is preheated according to the preheating time of the air heater, so that the air heater is preheated through different preheating time according to different outdoor temperatures, the preheating effect that a compressor of the air heater is normally started under different working conditions can be achieved at different temperatures, and the probability of successfully starting the air heater is improved. When the preheating time is up or when an instruct