The utility model disclosed a T-shaped work-piece inversion-resisting feeding device with a sensing alarm function, comprising a feeding pipe and a feeding clamp arranged below the feeding pipe and capable of horizontally moving. The feeding clamp is further provided with a clamping piece which is internally provided with an inner cavity matched with the shape of a thick end of the T-shaped work-piece and just opposite to the outlet of the feeding pipe, the inner cavity is further provided with an opening in movement direction, and the width of the opening is larger than the diameter of the thin end of the T-shaped work-piece but less than the diameter of the thick end. Once the inverted T-shaped work-piece drops into the inner cavity of the clamping piece, the thick end of the T-shaped work-piece cannot pass through the opening of the clamping piece, so that the work-piece is clamped in the clamping piece and cannot be feed out, so that the purpose of protecting the machine by preventing the output of the inverted work-piece. In addition, through the sensing alarm function of the T-shaped work-piece inversion-resisting feeding device, the operator can be reminded in time for corresponding operation during the inversion of the work-piece.