The invention relates to a thermocompression processing method for a quadrangle welding magnetic pole coil, belonging to the technical field of generators. The thermocompression processing method for a quadrangle welding magnetic pole coil comprises the step of placing an interturn insulator on the quadrangle welding magnetic pole coil and is characterized by comprising the following steps: firstly, hoisting coil side press tool equipment on an oil press; placing the quadrangle welding magnetic pole coil provided with the interturn insulator into the side press tool equipment; sequentially placing diselectric paper and a hot-press film at the inner diameter of the quadrangle welding magnetic pole coil; when gluing paper is placed, overlapping two layers in a staggered way; fixing the gluing paper by a double sticky tape; clamping the lead position of the magnetic pole coil and a control cabinet conducting clamp of a direct current machine; and then heating to carry out thermocompression molding processing. The invention has the advantages of simple process, high insulation heat resistant grade, raw material saving, time and power saving processing, low cost of the whole machine unit, attractive appearance, favorable heat dissipation effect and electric performance, and the like and can prevent phenomena of poor sticking, looseness and a short circuit.