The invention discloses an insert-type U-shaped cable clamp and a manufacturing method thereof. The insert-type U-shaped cable clamp comprises a U-shaped clamp and a bottom plate. The U-shaped clamp is machined and manufactured according to the design dimension requirements, and a connecting hole is reserved or formed in the bottom of the U-shaped clamp; the bottom plate is machined and manufactured, and the bottom plate is inserted into the connecting hole; a fire-resistant mold is manufactured according to the dimensions of the U-shaped clamp and the bottom plate, the U-shaped clamp and thebottom plate are placed into the fire-resistant mold to be positioned and fixed, and thus the junction of the bottom plate and the connecting hole of the U-shaped clamp is exposed into the mold; a crucible with the bottom being provided with an outlet is arranged above the U-shaped cable clamp, and the bottom outlet of the crucible is aligned at the connecting hole in the bottom of the U-shaped clamp; and the needed self-propagating welding powder mass is estimated according to the dimensions of the connecting hole and the bottom plate, and welding powder placed in the crucible is ignited in aself-propagating welding mode to weld the bottom plate and an insert opening of the U-shaped clamp. The casting defects and the welding defects of the connecting force-bearing portions are preventedfrom occurring to the U-shaped cable clamp with the bottom plate, the safer and more reliable effects are achieved, the service time is longer, and the strength of weld zones is improved greatly.