The invention discloses a semi-automatic butt joint machine for manufacturing a three-way pipeline. The semi-automatic butt joint machine comprises a vertical plate seat, a horizontal plate seat, an interface fixing frame, pushing mechanisms, clamping mechanisms, binding lantern rings, a manual butt joint mechanism, a conveying mechanism, an inner repair welding device, a cutter and an outer repair welding device; one side of the vertical plate seat is provided with the horizontal plate seat arranged perpendicularly to the vertical plate seat, and two pipelines required to be connected throughbutt joint are respectively a vertical pipe and a horizontal pipe; the top side of the interface fixing frame is provided with the cutter, and one end of one pushing mechanism is provided with the inner repair welding device internally; one side of the binding lantern ring close to the vertical pipe is provided with the outer repair welding device; and all the bottom ends of the interface fixingframe, the pushing mechanisms and the clamping mechanisms are fixed to the top side of the vertical plate seat, and all the bottom ends of the binding lantern rings, the conveying mechanism and the manual butt joint mechanism are fixed to the top side of the horizontal plate seat. The semi-automatic butt joint machine is rational in structure, and facilitates guarantee of precision; repair weldingfor the interface joints of the pipelines can be performed, and the semi-automatic butt joint machine facilitates guarantee of the perpendicularity of three-way pipelines during butt joint; and the occurrence of deviation is reduced.