A tablet electronic product supporting frame includes an encapsulation box. The encapsulation box is rotatably coupled, at a front side thereof, with a carriage base. The carriage base has four fastening members to respectively couple with an upper clamp member, a lower clamp member, a left clamp member, and a right clamp member, so that the upper clamp member, the lower clamp member, the left clamp member, and the right clamp member are rotatably mounted to the carriage base and are allowed to adjust of the positions thereof for clamping. The carriage base is provided, on a front surface thereof, with a backing plate that is mounted thereto by an adjustment screw rod. As such, a supporting frame that is fit to carry and support tablet electronic products of various sizes and helps improve stability and burglary protection is provided.