The utility model discloses a foundation pit protection frame, the utility model relates to foundation pit protection technical field, including the protection board, the protection board and the lateral wall of foundation pit are pasted together, lower support spare, lower support spare sets up between the bottom of foundation pit and the lower extreme outside of protection board, upper support spare, upper support spare sets up between the upper extreme outside of two protection boards, connecting piece, connecting piece sets up in the one end of upper support spare away from one of protection boards, adjusting part, adjusting part installs one end of upper support spare. The foundation pit protection frame, and the upper support spare is connected two protection boards through adjustable mechanism, and the movable rod is cooperated with the limiting hole of different position through the limiting screw, realizes the length regulation, and adjusting part is cooperated through the knob, the screw rod and the dovetail slide block, can be adjusted the connecting piece flexibly, makes the close -fitting piece can close another protection board closely, can according to the actual size and shape of foundation pit, the structure of protection frame is adjusted conveniently.
