Control system and method for roasting system in pretreatment of waste lithium battery

The invention discloses a control system of a roasting system in pretreatment of a waste lithium battery. The control system comprises a preheating subsystem; the preheating subsystem comprises a preheater, preheater chain plate machine equipment, conveying and processing equipment for chain plate machine offline, an air draft fan, an oxygen content sensor and a DCS (Distributed Control System), and the output ends of the preheater chain plate machine equipment, the conveying and processing equipment for chain plate machine offline, the air draft fan and the oxygen content sensor are connected to the DCS; the DCS system controls the opening and closing of a preheater and the opening and closing of a preheater chain plate machine according to state signals transmitted by preheater chain plate machine equipment, chain plate machine offline conveying and processing equipment, an air draft fan and an oxygen content sensor; the output end of the DCS system is connected with a preheater outlet hydraulic valve and u