Single-shaft stabilized platform device for rotary steering drilling tool and stabilizing method thereof

The invention discloses a single-shaft stabilized platform device for a rotary steering drilling tool and a stabilized method thereof. A pressure-bearing case is fixedly connected inside a drill collar, a single-shaft stabilized platform body, a torque motor, a main power, a rotary steering control system and a power transmission set are arranged inside the pressure-bearing case, the torque motor is connected with the single-shaft stabilized platform body, and the power transmission set is arranged between the torque motor and the single-shaft stabilized platform body. When the drill collar rotates, the rotary steering control system controls the torque motor to apply a force which is opposite to the rotary direction of the drill collar on the single-shaft stabilized platform body so that the single-shaft stabilized platform can keep static and stable relative to the ground. According to the single-shaft stabilized platform device for the rotary steering drilling tool, the single-shaft stabilized platform can