Concealed-type security door

The utility model relates to a concealed-type security door, belonging to the technical field of antitheft doors. Eight measures provided by the utility model mutually cooperate. The concealed-type security door is realized through the improvement and the perfection of the existing patent result by the inventor. The concealed-type security door is structurally characterized in that a travel switch is installed in a door, a reed switch is installed above a lock hole and below an antitheft cover, the two switches jointly form an alarm starter, a timed feedback circuit converts the signals of the two switches into usable electric signals, then a diode or door multi-code transmitting part transmits the electric signals, the interference caused by various electric appliances in the society is avoided, outgoing personnel are informed in time, field alarms are given out, an alarming sound sheet and a power amplifier integrated circuit are used to form a field warning device, the concealed-type security door can be m