The invention discloses an intrusion alarm system for a power system control machine room, and the system comprises a triggering module, a power module, a single-chip microcomputer, and a sound-light alarm module. A signal output end of the triggering module is connected with the single-chip microcomputer, and the single-chip microcomputer is also connected with a storage unit, a timer, a power module, an audio decoding module, a video decoding module, the sound-light alarm module, and a wireless transmitter. According to the invention, the system is additionally provided with an induction triggering module on the basis of a conventional security and protection camera, achieves the monitoring of the interior of a machine room through employing the technology of microwave body sensing, has no monitoring dead angle, is high in imperceptibility, employs a power supply with a function of power-off protection, prolongs the service life of the single-chip microcomputer, can give an alarm and record a picture and audio information when a crasher intrudes, and transmits the picture and information outwards through a wireless network. The system is good in imperceptibility, is diversified in function, and is good in effect of security and protection.