The utility model provides a take the mould of cotter hole, the purpose reduces the degree of difficulty that the mould was maintained. Technical scheme below adopting: take submodule of cotter hole,specifically, the submodule is the axle bush form, the extrados of axle bush form is the matching face of submodule, the matching face is semi -cylindrical surface, the interior cambered surface of axle bush form is the working face of submodule, the horizontal terminal surface of axle bush form is the adjacent surface of submodule, vertical terminal surface of axle bush form is that the mould ofsubmodule connects the face, the mould connects the face to go up the system has a plurality of accessing to the cotter hole that matches the face, the axis perpendicular to of cotter hole the mould connects the face. The utility model discloses a take submodule of cotter hole has following advantage: the mould input cost of manufacturing enterprise can reduce by a wide margin, repair the submodule and trade the support time weak point of submodule, and the maintenance is maintained simply.