The invention belongs to the technical field of a digital instrument control system in a nuclear power station and provides a redundancy control equipment of the digital instrument control system, the digital instrument control system and a control equipment main/standby redundancy control method. The control equipment comprises a main control device and a standby control device, wherein the main control device is provided with a first controller and a first CPLD, the standby controller is provided with a second controller and a second CPLD, the first controller and the second controller are respectively provided with a fault determining unit, a fault state result is outputted to the first CPLD when the fault determination unit of the first controller determines that the main control device is in fault and the standby control device is not in fault, the main control device is set by the first CPLD to be in a fault state, the second CPLD is set to be in a main state when a fault state of the first CPLD is acquired by the second CPLD, and the standby control device becomes a main control device. The whole control equipment is advantaged in that a redundancy arbitration speed is faster, and reliability is higher.