The invention discloses a balanced operation control method for a four-rotor aircraft provided with mechanical arms. The method comprises the following steps that: 1, a system platform is constructed, wherein the system platform includes a four-rotor aircraft, a servo mounting bracket, mechanical arms, a balance mechanism, a wireless communication module, a servo controller, a flight controller and a PC; 2, a carrier coordinate system is established, the installation directions of the mechanical arms are determined; and 3, the movement target angles of the mechanical arms are set and are transmitted to the servo controller through the wireless communication module, the servo controller controls the joint servos of the mechanical arms to move to the set angles, and the movement angles of the joint servos are fed back to the servo controller, a target angle by which the balance mechanism needs to rotate is calculated, and the balance mechanism receives an instruction sent by the servo controller and moves for the target angle. The method of the invention has the advantages of simple structure, simple and reliable balance calculation and stable and safe operation of the mechanical arms. With the method of the invention, hardware and software resources can be saved, and the influence of the movement of the mechanical arms on the stability of an aerial operation platform is eliminated, and the precision of aerial operation is improved.