The invention relates to a front cover of an unmanned aerial vehicle protecting cylinder, and belongs to the technical field of transmission. Through the adoption of the front cover disclosed by the invention, during storing and transporting, the front cover is in close fitting with other parts of the protecting cylinder, so that the water tightness of the protecting cylinder is realized; during transmitting, energy provided by an electric actuator is utilized to destroy a connecting link of the front cover, and a certain initial velocity is provided for the front cover, so that under the effect of thrust of the actuator, the front cover can be reliably, safely and quickly separated from the protecting cylinder, at the moment of separating, instantaneous impact load cannot enable the protecting cylinder to collapse, the situation that the protecting cylinder greatly sinks is avoided, and the protecting cylinder is not damaged; and then a separating part of the front cover is overturned and separated along a guiding groove to keep off a transmitting channel of the unmanned aerial vehicle. The scheme of the front cover disclosed by the invention is simple in structure and reliable in working; and before transmitting, the water tightness of the protecting cylinder can be guaranteed, and during transmitting, the front cover can be quickly and reliably opened for keeping off a moving channel for the unmanned aerial vehicle.