The invention discloses a control system based on a profibus redundant network topological structure and a switching method of the control system. A master control system and a hot-standby system respectively serve as main stations of two networks, can simultaneously control slave stations under the networks, and both have the control right of a bus; in addition, the master control system and thehot-standby system also respectively serve as the slave stations in the network of the opposite party so as to realize mutual supervision communication and enhance the stability and the redundancy ofthe system. When the master control system fails, the master control system can be switched to the hot-standby system to work in a seamless way. Through the topological structure, data processing (dp) modules of all manufacturers can be used; simultaneously a dp/dp coupler module does not need to be used any longer; the risk cost of the system is reduced; and the reliability of the overall systemis enhanced.