The utility model provides a steel -pipe pile truss on protection side bar slope, relates to side slope protection field, and its structure is: top and channel -section steel (4) fixed connection of steel -pipe pile A (1) and steel -pipe pile C (9), channel -section steel (4) fixed connection adopts slip casting ductule B (8), ductule B (8) and channel -section steel (4) vertical fixation, domatic laying is followed in channel -section steel (4), be provided with geotechnological cloth (5) on domatic (2), lay stone masonry layer (3) between channel -section steel (4), stone masonry layer (3) are with geotechnological cloth (5) compaction, the toe position of domatic (2) sets up concrete base (7) and lays longitudinal drainage pipe (6). The utility model has the advantages of adopt truss -like steel -pipe pile structure, furthest's performance the compressive property of structure member, avoided in the friction pile gliding power to steel -pipe pile shear force that produces and the power of toppling simultaneously, to the destruction of cling compound pile body, whole protective structure has the construction convenience, the equitable science of atress, characteristics that engineering cost is little.