Automatic floating device and casting grinding equipment using automatic floating device

The invention discloses an automatic floating device and casting grinding equipment using the automatic floating device. The automatic floating device comprises a fixed frame, a first pushing mechanism, a second pushing mechanism, a driving control mechanism and a pressure sensor, wherein the fixed frame, the first pushing mechanism, the second pushing mechanism, the driving control mechanism andthe pressure sensor are fixedly arranged on a worktable, the first pushing mechanism is used for connecting external tools, the first pushing mechanism can be arranged on the fixed frame in a front and back sliding mode, the driving control mechanism is fixedly arranged on the fixed frame, the driving control mechanism is used for controlling the second pushing mechanism to move forward and backward along the fixed frame, the pressure sensor is arranged between the first pushing mechanism and the second pushing mechanism, the first pushing mechanism and the second pushing mechanism are ejectedand pressed on two sides