The invention discloses an automatic rotation part for a support material. The automatic rotation part comprises a small automatic 180-degree rotation table, a rotation table sliding saddle, a linear rail, a bracket base plate, an L-shaped bracket, a V-shaped bracket, an inductive switch support, a front limit stop block, a connection rod, a sleeve, a support cylinder, a spring, a sliding rod, a bearing, a front press cover and a rear press cover. The rotation table sliding saddle is fixed above the linear rail which is fixed on a front tailstock sliding saddle, the front limit stop block is fixed on the front side of the rotation table sliding saddle, the small automatic 180-degree rotation table is fixed above the rotation table sliding saddle, the bracket base plate is fixed on the small automatic 180-degree rotation table 4, the L-shaped bracket is fixed on the bracket base plate, the V-shaped bracket is fixed on the L-shaped bracket, the inductive switch support is mounted on the rotation table sliding saddle, an inductive switch is mounted on the inductive switch support, the connection rod is fixed between the rotation table sliding saddle and an internal sliding guide rod of the sleeve, a tailstock is mounted on a tailstock base, front and rear baffles are mounted on the tailstock base to prevent the bearing from being exposed, and the tailstock base is mounted on the front tailstock sliding saddle. By means of the automatic rotation part, automation is achieved, and a basis is provided for continuous production.