Cable trench antitheft system

The utility model belongs to a power transmission system antitheft system, and especially relates to a cable trench antitheft system arranged in a cable trench. The cable trench antitheft system comprises piezoelectric sensors, a sound control lamp, a controller, a relay, an alarm and a wireless communication module, wherein the number of the piezoelectric sensors is no less than two; all the piezoelectric sensors and the sound control lamp are in connection with input terminals of the controller; the wireless communication module is in connection with a low voltage control circuit terminal of the relay, and a high voltage work circuit terminal of the relay is respectively in connection with the alarm and a power line. The cable trench antitheft system has the characteristics of simple structure, multiple alarm mechanism, sensitive induction and low cost.