The invention provides a cable well lid opening device and a work method thereof, aiming at providing a cable well lid opening device which is simple in structure, convenient for moving of a lid body and high in safety, and a work method of the a cable well lid opening device. A well lid comprises a lid body, the opening device comprises four groups of lifting mechanisms and a trolley, two sides of the well mouth are respectively provided with containing holes symmetrically, the four groups of lifting mechanisms are arranged in the containing holes in a paired symmetric manner; each lifting mechanism comprises an electric push rod assembly, an electric control box, a controller and a solar panel, the electric push rod assembly comprises a motor and a push rod, the electric control box comprises a storage box and is connected with the motor, the controller controls the motor to act through the electric control box, the solar panel is level with the top surface of the well mouth, the solar panel is connected with the storage battery, the trolley comprises a body and a plurality of balls, the balls are arranged on the top surface of the body, and traveling wheels are arranged on the bottom surface of the body. The cable well lid opening device and the work method thereof have the advantages that the processing is convenient, and the safety is improved.