Railway signal device utilizing dual-CPU (central processing unit) redundancy and control method of railway signal device

Disclosed are a railway signal device utilizing dual-CPU (central processing unit) redundancy and a control method of the railway signal device. The railway signal device comprises a CAN (controller area network) communication circuit, a first CPU, a second CPU, a primary and backup state flag, a synchronous circuit, an input buffer, an output buffer, an output switch controller, an output switch circuit, an output selecting chain, a state detecting circuit, a logic or gate circuit, a dynamic acquisition circuit, a current detector, an overload protection circuit and a voltage detector. By the device and the control method, dual-CPU starting and hot reset of the railway signal device are achieved, primary-backup switching and control of the signal device under strong interference source are achieved, intelligence of an electronic executing unit of the railway signal device is higher, fault can be identified according to different site working conditions, and accordingly fast fault positioning and fast maintenance are achieved. In addition, by fast network communication between on site equipment and upper-level equipment such as a control center, the upper-level equipment such as the control center can master operation conditions of the on site equipment at any time.