The utility model provides a mold frame plate inclined hole angle detection device, and relates to the technical field of mold manufacturing and detection. The device is characterized in that the base is installed on a detection table, a rotatable rotating seat A is installed on the base, a rotatable rotating seat B is installed on the rotating seat A, arc-shaped through grooves are formed in the rotating seat A and the rotating seat B, and a locking screw A and a locking screw B are installed in the arc-shaped through grooves in the rotating seat A and the rotating seat B respectively; according to the utility model, the rotating seats A and B on the base are matched with the locking screws A and B and the bubble instrument, so that accurate leveling can be realized, and detection errors can be eliminated; height adjustment of the top plate and the movable plate is achieved through supporting columns, lead screws and the like to adapt to formwork plates of different thicknesses, and universality is improved. The dial is matched with the swing rod, the length of the detection part can be adjusted, the angle can be visually read, and the detection efficiency is improved; the structure formed by the hydraulic rod, the sleeve seat and the like can be adaptively adjusted and stably contacted with the inclined hole, so that the detection accuracy is guaranteed.