The invention belongs to the technical field of wire rolling equipment, and in particular to an automatic molding machine of an S-shaped wire. The automatic molding machine comprises a rack and a machining table mounted on the rack. A wire adjusting mechanism for straightening and flattening the reel type wire is arranged on one side of the rack. A wire guide mechanism for conveying the wire is mounted at the position, at the wire outlet end of the wire adjusting mechanism, on the rack. A wire pressing mechanism for machining and fixing the wire is mounted at the position, at the wire outlet end of the wire guide mechanism, on the rack. A wire cutting mechanism for cutting off the wire in an equal length manner is mounted at the position, between the wire pressing mechanism and the wire guide mechanism, on the rack. A molding mechanism cooperating with the wire pressing mechanism for wire bending action is arranged at the position, below the wire pressing mechanism, on the machining table. A first wire bending device used for bending the wire with a small caliber and a second wire bending device used for bending the wire with a large caliber are arranged on the molding mechanism. According to the automatic molding machine, the molding effect and production efficiency of the S-shaped wire are improved, the structure is reasonable, operation is simple and convenient, security coefficients are high, and the automatic molding machine is suitable for large-batch assembly line production and use.