Single-axis stable platform device for rotary-steering drilling tool

The utility model discloses a single-axis stable platform device for a rotary-steering drilling tool. A pressure bearing shell is fixedly connected into a drill collar, a single-axis stable platform body, a torque motor, a main power source, a rotary steering control system and a power transmission device are arranged in the pressure bearing shell, and the single-axis stable platform body is supported in the pressure bearing shell; the torque motor is connected with the single-axis stable platform body, and the power transmission device is arranged between the torque motor and the single-axis stable platform body. During the rotation of the drill collar, the torque motor supplies a force, opposite to the rotating direction of the drill collar, to the single-axis stable platform body through the control of the rotary steering control system, so that the single-axis stable platform body can keep static stability relative to the ground. According to the single-axis stable platform device for the rotary-steering