Integral steel support protection structure of foundation pit

The utility model discloses an integral steel support protection structure of a foundation pit. The integral steel support protection structure comprises a support structure I and a support structure II, the first supporting structure comprises surrounding purlins at the two ends, steel pipes and adjustable heads. The enclosing purlins, the steel pipes, the adjustable heads and the enclosing purlins are sequentially connected, and the enclosing purlins at the two ends abut against the concrete support piles. The second supporting structure comprises surrounding purlins at the two ends, steel pipes and movable heads. The device further comprises a first connecting piece and a second connecting piece. The first connecting piece is fixed to the concrete support pile through an expansion bolt, the enclosing purlin at one end is arranged between the first connecting piece and the second connecting piece, and the movable head and the enclosing purlin at the other end are arranged between the second connecting piece