The invention discloses a frame automatic leveling device and method. The automatic leveling device comprises a control mechanism and an actuating mechanism. The actuating mechanism comprises five magnetic exchange valves, four horizontal oil cylinders and four perpendicular oil cylinders, wherein the horizontal oil cylinders are used for controlling supporting legs of a frame to horizontally stretch, and the perpendicular oil cylinders are used for adjusting the horizontal positions of the four supporting legs. The automatic leveling device is characterized in that the control mechanism comprises a control chip, a double-shaft leveling controller, a travel switch and four grounding switches; the double-shaft leveling controller, the travel switch, the grounding switches and the five magnetic exchange valves are all connected with the control chip; the double-shaft leveling controller is arranged on the frame and used for acquiring signals of horizontal tilt angles of the frame in the transverse direction and the longitudinal direction. Compared with the prior art, the frame automatic leveling device has the following advantages that according to the scheme and by the adoption of the control method, the response time is short; manual leveling by workers is not needed by the adoption of one-key automatic leveling; by the utilization of a seamless connection module, configuration flexibility of hydraulic aerial cages is improved.