The utility model relates to a semi -automatic casting machine of rotatable formula, including the frame to and connect the platen in the frame through the pivot, following the horizontal direction onthe platen and being equipped with left movable mould hydro -cylinder and right movable mould hydro -cylinder, the tailpiece of the piston rod of left and right movable mould hydro -cylinder is relative to be connected with left movable mould and right movable mould respectively in the tailpiece of the piston rod of left and right movable mould hydro -cylinder, install the ejector pin that runs through the platen on the platen that left movable mould and right movable mould compound die were located, the below of platen is fixed with down the movable mould hydro -cylinder through the lower carriage, and the tailpiece of the piston rod of lower movable mould hydro -cylinder is vertical upwards to the tailpiece of the piston rod of movable mould hydro -cylinder is fixed with down the movable mould under in, the movable mould is relative with the lower extreme of ejector pin down, the bottom of frame is fixed with rotatory hydro -cylinder, and the cylinder body of rotatory hydro -cylinder is connected with the frame, and the tailpiece of the piston rod of rotatory hydro -cylinder is connected through the pivot with one side of platen edge, the utility model discloses made optimizingto traditional casting machine and improved, improved and filled type efficiency, reduced defects such as the product is loose, shrinkage cavity, clamp sediment, improved the performance of product.