The invention discloses a safety check door. The safety check door comprises a drug/exploder detection subsystem, a special nuclear substance/radioactive substance detection subsystem, a control analysis subsystem and an isolation device, wherein the three subsystems are arranged together inside a check door shell; and the isolation device is used for isolating the drug/exploder detection subsystem from the special nuclear substance/radioactive substance detection subsystem so that both subsystems can operate independently without interfering with each other. Therefore, both detection subsystems are combined together and operate reliably to complete the task of checking the drug/exploder and the special nuclear substance/radioactive substance carried by pedestrians; thus, the safety check door increases check efficiency while ensuring accuracy and reliability.