Anti-freezing control method and device for surface air cooler and surface air cooler

The invention relates to a surface air cooler anti-freezing control method, device and system and a surface air cooler. The anti-freezing control method for the surface air cooler is used for controlling a drain valve and a first heating device and comprises the steps that S1, whether the surface air cooler is started or not is detected; s2b, if the surface air cooler is shut down, the shutdown duration is obtained; s3b, if the shutdown duration is greater than or equal to a preset duration, controlling the drain valve to be opened; s4b, if the shutdown duration is smaller than the preset duration, the waterway temperature is obtained; s5, acquiring a basic anti-freezing mode according to the waterway temperature; s6, obtaining a final anti-freezing mode according to the basic anti-freezing mode; and S7, according to the final anti-freezing mode, opening and closing of a drain valve and a first heating device are controlled. According to the anti-freezing control method, control device and system for the surf