Diesel motor coolant heating method considering deviation of pointer type water jacket heater

The invention relates to a diesel motor coolant heating method considering the deviation of a pointer type water jacket heater, which comprises the following steps of: when the coolant temperature of a cooling pipeline is updated, judging whether the coolant temperature is less than a first threshold value, and if so, sending a starting instruction to the pointer type water jacket heater; when the pointer type water jacket heater fails to start, whether the updated coolant temperature is smaller than a second threshold value or not is judged, and if yes, a starting instruction is sent to a diesel generator body heater; when the pointer type water jacket heater or the diesel generator body heater is in the running state, when the coolant temperature of the cooling pipeline is updated, whether the coolant temperature is larger than a third threshold value or not is judged, and if yes, a stop instruction is sent to the diesel generator body heater; when the diesel generator body heater fails to stop, whether the