The invention discloses an online controller for controlling circulating, insulating, cleaning and plasma melting of raw blood plasma bags. The online controller mainly comprises a working platform, a circulating, insulating and soaking tank, an equipment box body, a circulating water washing station, a first compressed air washing station, a conveyer belt, an alcohol tank, a conveyer belt, a fresh water washing station, a second compressed air washing station, a main transmission motor, a circulating water and alkali liquor circulating system, an alcohol circulating system and an electrical appliance control system. According to the invention, by virtue of the accurate online control on plasma melting temperatures, biological activities of various biological proteins in blood plasma are protected, and the loss of the plasma proteins in an upstream process is effectively reduced; a series of continuous cleaning operations of automatic cleaning, disinfection and leaky bag eliminating and the like on the blood plasma bags in a plasma melting process are implemented by virtue of online computer automation control, thus avoiding cross contamination caused by open-type operation in the plasma melting process; in addition, the water circulating and alcohol filtering devices are designed and mounted, thus greatly reducing the consumption of alcohol and water for injection and achieving remarkable benefits of energy conservation and consumption reduction.