The utility model discloses an intelligent double way closed loop alarming probe with automatic diagnostic function and corresponding host computer. The alarming probe consists of an encoding and decoding carrier wave receiving module, a stimulating target signal module, a low consumption singlechip machine, a sensor, a sending and receiving double way data coupling circuit and a power supply which are mutually and electrically connected. The host computer consists of the encoding and decoding carrier wave receiving module, the low consumption singlechip machine, a code display screen for probe faults, a hand holding remote controller, a combined aural and visual alarm, the sending and receiving double way data coupling circuit and the power supply which are mutually and electrically connected. The alarming probe and the host computer are both controlled by programs of the singlechip machine so as to realize the receiving and sending operations of a wire or wireless encoding and decoding signal, and further to realize the double way completely closed automatic diagnostic fault inspection of the alarming probe and the system as well as to configure a fireproof or theft preventing alarming system with high reliability. The utility model having excellent practicable value can be extensively used in the places such as households and office rooms.