The present invention provides a redundancy switch system for a flexible direct current transmission system, belonging to the technical field of direct current transmission. Each set of redundancy switch device of the system comprises: state AND gate output signals of a corresponding redundancy switch device and state AND gate output signals of the other redundancy switch device are subjected to negation and forbidding switch signals are subjected to assertion to take as one input of a corresponding trigger; the state AND gate output signals of the corresponding redundancy switch device and the state AND gate output signals of the other corresponding redundancy switch device are subjected to negation and the forbidding switch signals are subjected to assertion to take as the other input ofa corresponding trigger; the two output ends of the corresponding trigger of one set of redundancy switch device and the two output ends of the corresponding trigger of the other redundancy switch device are subjected to logic or operation and then are respectively used to output master and slave state signals of the two sets of the redundancy switch devices. The special redundancy switch systemachieves the switching function of the master and slave systems in the flexible direct current transmission system so as to improve the operation reliability of the flexible direct current transmission system.