The invention relates to a square single-core metal sheath oil-submerged pump cable and a production method thereof, and belongs to the technical field of oil-submerged pump cables. According to the technical scheme, the cable comprises a tin-plated stranded conductor (1), a fluoroplastic insulating layer (2), a stainless steel sheath layer (3) and a polypropylene sheath layer (4), the tin-plated stranded conductor (1) is coated with the fluoroplastic insulating layer (2) in an extrusion mode to form a single-core cable, the stainless steel sheath layer (3) is arranged outside the single-core cable and is coated with the polypropylene sheath layer (4) in an extrusion mode, and the polypropylene sheath layer (4) is square. The tin-plated stranded conductor is high in flexibility and bendability, the fluoroplastic insulating layer is excellent in electrical property and high in insulation grade, the stainless steel sheath layer is high in external force resistance and has good mechanical protection and isolating functions, and the square polypropylene sheath layer has good mechanical protection function and is easy to fix and not prone to overturn.