The utility model discloses a device for monitoring transmission line pole tower slope which includes a data collecting terminal, a wireless communication network and a mavin analytical device. The data collecting terminal includes: a solar panel charges an accumulator, transmits signal to a preliminary treatment unit through a slope angle sensor, the preliminary treatment unit transmits the signal to a centre data processing unit, the centre data processing unit transmits the signal to the mavin analytical equipment computer through the wireless communication network. The device has reasonable structure and easy operation which transmits data through wireless relay GSM/CDMA/GPRS network. When unconventionality thing occurs, the device alarm with many methods for clewing managerial employee regarding or taking necessary cautionary measures which can reduce current failure times, increase electrical service reliability and ensures electric network sureness operation. The device can be widely used in electrical service electric power monitoring device.