The invention relates to the technical field of concrete prefabricated slab production and provides a 
control system and method for a fixed mold table intelligent maintenance unit. The control systemcomprises a maintenance unit, a PLC, a human-computer 
interaction interface and 
signal acquisition equipment. The maintenance unit comprises 
softened water equipment, an electromagnetic boiler, a circulating water pump, a heating 
pipe, a steam generator and an exhaust hose. According to the 
control system, heating and humidification are controlled in a separated manner, and the temperature, 
humidity and temperature rise and fall rates are precisely controlled; the time is strictly controlled, the phenomenon that the surface has cracks due to severe temperature change can be prevented, and theproduct quality is guaranteed; 
electric equipment is adopted, no harmful gas such as 
nitrogen gas and 
oxide gas is generated in the process, and quite high 
environmental protection performance is achieved; an almost closed heating 
pipe system is adopted, 
water consumption caused by heating is little, and only a certain amount of water is consumed in the product humidifying process; and the final condensate water is collected and can be utilized cyclically, and 
water resources can be effectively saved.