I-shaped steel tunnel support decompression detecting device

The utility model relates to a mine tunnel support tool, in particular to an I-shaped steel tunnel support decompression detecting device. The I-shaped steel tunnel support decompression detecting device comprises a U-shaped groove and is characterized in that an opening of the U-shaped groove is downward, a valve is installed at the top end of a side wall of the U-shaped groove, a steel plate is arranged in the U-shaped groove, a sealing pad is arranged between the steel board and the U-shaped groove; confined space formed between the steel plate and the U-shaped groove is filled with water; two through holes are formed in the valve, the diameter of an inner cavity of each through hole is larger than the diameter of a porthole, a steel ball, a spring, a screw with a handle and a weep hole are arranged in sequence, starting from the porthole, in the inner cavity of each through hole, and the screw with a handle penetrates through a porthole, at the other end of the inner cavity, and extends out of the valve.