Method for preventing accident of cross operation by five-prevention shutting system

The invention discloses a method for preventing accident of cross operation by a five-prevention shutting system, which belongs to the technical yield of safety of power plant equipment. The method comprises the following steps of firstly, adding the logic shutting of cross operation into the logic shutting of the prior five-prevention shutting system; when the working ticket and operation ticket information input into the five-prevention shutting system have the cross operation, starting the logic shutting of the cross operation; as for a plurality of operations acting on the same object, adding a suspended warning board code of the corresponding object into a computer simulation logic diagram, wherein the object is stored into a working ticket and an operation ticket before operation and stored in a logic shutting memory of the cross operation; judging whether the cross operation exists or not by the quantity of the object boards, only all the working tickets are taken back, can the operation ticket and a computer key be taken to carry out side operation; and finishing the return operation of a key state. In the invention, the cross operation and the common operation are very intuitively distinguished, and the safety problem caused by multiple cross operation ranges and overlapped safety measures in the process of comprehensive examination and repair of a power plant is effectively solved.