The invention discloses a single-phase power supply transformer and relates to the technical field of transformers. The single-phase power supply transformer comprises a magnetic core, a coil and a shell, wherein the shell is prepared from the following raw materials: reinforced polyformaldehyde, poly-butylene tertephehalate, butylation aryl phosphate, trimethylolpropane, expanded graphite, kaolin, porous silicon dioxide, erionite, sepiolite powder, a lubricant, a plasticizer, an aluminic acid ester coupling agent and an antioxidant. The single-phase power supply transformer disclosed by the invention is simple and convenient in shell preparation, green and environmentally friendly, excellent in mechanical property, electromagnetic shielding property, high temperature resistance, flame retardancy, weather aging resistance, and the like, light in weight, rapid in heat radiation, wide in application range, and long in service life.