Railway safety control system and method based on single CPU and meeting two-out-of-two requirement

The invention discloses a railway safety control system and method based on a single CPU and meeting the two-out-of-two requirement. The defects of a safety control system in a double two-out-of-two redundant architecture in the prior art are overcome. Self-inspection is continuously performed on a power supply, a CPU and peripherals thereof in the operation process, the control panel is considered to be invalid when self-inspection cannot be passed, and the control panel guides a control object to a safe side and then quits operation. And meanwhile, the control panel operates two twinborn safety programs in each cycle to process the two paths of safety input respectively, and safety comparison is performed on operation results of the two twinborn programs to form safety output, so that safety failure caused by external input single-point failure is prevented, and a two-out-of-two function of controlling external equipment is completed. The two twin programs can prevent operation failure caused by a single-po