Composite foundation pit supporting pile

The invention provides a composite foundation pit supporting pile, and relates to the technical field of foundation pit supporting. Comprising first fixing rods, fixing plates, supporting rods and cross beams, the first fixing rods are embedded in the periphery of a foundation pit, the supporting rods are embedded in the edge of the foundation pit, the fixing plates are laid on the periphery of the foundation pit, and the first fixing rods are connected with the supporting rods through the fixing plates; a plurality of one-way rotating devices are arranged in the height direction of the supporting rods at intervals, and the one-way rotating devices arranged on the same height of every two adjacent supporting rods are connected through a cross beam. By arranging the one-way rotating device, a worker can freely adjust the fixing angle of the cross beam when installing the supporting piles, namely, the supporting piles are embedded at the corners of the foundation pit, the supporting piles on the two sides can b