The embodiment of the invention provides a multi-main-control redundancy switching control method and system. The method comprises the steps that a random control unit X is set as standby main equipment, the control unit X carries out main and standby communication with other standby main equipment, and state data of each standby main equipment is obtained; if there is no main control equipment inthe communication network at preset or the present main control equipment needs to be replaced, and the control unit X determines whether a main control condition is met according to the state data of each standby main equipment; and if YES, the control unit X is set as the main control equipment. Thus, switching of the main control equipments is determined by each standby main equipment independently, external signal control or artificial intervention is not needed, multiple standby main equipments in the network can obtain the network control right by free competition, the number of the standby main equipments in the network is not limited, the adapted and automatic degree is improved effectively, and the defect that accumulation data is miscalculated during redundancy switching is overcome.