The invention discloses an aerial ladder fire truck rotary table and a leveling control method thereof. A proportional valve is connected with a leveling oil cylinder. Two tilt angle sensors are arranged on the rotary table. The two tilt angle sensors and the proportion valve are electrically connected with a controller. The output error caused by signal jumping of one tilt angle sensor is eliminated through signal comparison of the tilt angle sensors. The controller monitors the current feedback of the proportion valve in real time. Closed-loop control is conducted on the opening size of the proportion valve. The angular speed of rotary table movement is combined with an automatic proportion valve specialist PID level system to achieve automatic leveling of the rotary table. The aerial ladder fire truck rotary table and the leveling control method are high in applicability, and automatic adjusting of rotary table leveling can be conducted quickly according to the angular speed of the rotary table; detection is conducted through the double tilt angle sensors, the output error caused by signal jumping of one single tilt angle sensor can be eliminated according to signal comparison of the tilt angle sensors, and the security level is increased; the proportion valve current change caused by proportion valve resistance heating can be eliminated through closed-loop control of the feedback current.