The invention provides an electric push rod transmission structure suitable for a photovoltaic tracking support and aims to solve technical problems such as poor outdoor adaptability, short service life, high maintenance rate of an existing push rod and achieve the technical effects of simple structure, convenient and fast operation, high safety, high stability and high outdoor adaptability. The electric push rod transmission structure suitable for the photovoltaic tracking support comprises a screw rod, a shaft sleeve gear, a gear box body, a driving gear and a driving motor; the screw rod penetrates through the shaft sleeve gear and is in threaded fit with the inner wall of the shaft sleeve gear; the shaft sleeve gear is rotatably installed in the gear box body; the driving motor is fixedly installed on the gear box body; and the rotating power output end of the driving motor is meshed with the shaft sleeve gear through the driving gear.