The invention discloses a power transmission tower vibration monitoring device. The power transmission tower vibration monitoring device comprises basic parts and a monitoring box; the basic parts comprise a pedestal, an electric control system and a wind driven generator; the electric control system and the wind driven generator are arranged on the pedestal; the monitoring box is arranged on thepedestal; the monitoring box comprises a signal acquisition device; a weight and a sensor are arranged in the signal acquisition device; the weight is connected with the sensor through a spring; and the sensor is fixed on the box body. The inherent frequency of a system consisting of the weight and the spring and the inherent frequency of a power transmission tower have great difference, so that the fact that the weight vibrates along with the power transmission tower to accurately reflect the vibration condition of the power transmission tower can be guaranteed; and the signal of each sensoris transmitted to the electric control system to perform model analysis.