The invention relates to a bridge pier resisting the impact of debris flow and a manufacturing method thereof. The pier comprises a pier body and a diversion collision avoidance body, The lower part of the bridge pier body is sleeved with a flow guide collision avoidance body, one end of the upper end surface of the flow guide collision avoidance body is connected with the bridge pier body and ishigher than one end of the bridge pier body far away from the bridge pier body, the part of the flow guide collision avoidance body located on the flow face of the bridge pier body is of a spherical nose structure, and the spherical nose structure is gradually enlarged from the lower part to the upper part. The anti-collision body of the invention is spherical nose type, and can effectively reducethe impact force of the debris flow slurry on the bridge pier; The spherical nose structure can prevent the dragon head of debris flow slurry from being too high. The diversion anti-collision body isa double-layered structure with staggered inner and outer stiffeners, which can cause elastic-plastic deformation and consume impact energy of rocks when rocks collide with each other. The bulbous structure is slope-shaped, which can drain the rain and slurry in time and reduce the erosion of the protective measures. The back flow surface is provided with connecting plates in the arc section of the two-layer steel plate, which is convenient for construction and daily maintenance management.