Power-off and open-phase linkage alarm system

The utility model discloses a power-off and open-phase linkage alarm system, and relates to the technical field of breeding instruments. The alarm device comprises an alarm main box and a plurality of alarm sub-boxes, wherein the alarm main box is connected with the alarm sub-boxes; the alarm master box is arranged in a master control room and comprises a master box indicating lamp, an audible and visual alarm, a circuit breaker, a contactor, an access control power supply module and a relay module. The alarm sub-boxes are arranged at the fan power boxes and used for monitoring the operation states of the fan power boxes, and sub-box alarms are arranged on the alarm sub-boxes and used for giving an alarm when the fan power boxes break down. Each indicating lamp corresponds to one hog house, personnel can quickly know which hog house gives an alarm by checking during alarming, faults can be conveniently and timely processed, the alarm horns are connected in parallel, when one hog house gives an alarm, all the