The invention discloses a technical process of an X80 steel plate hot extrusion tee. The technical process comprises the following steps: (1) designing chemical compositions of raw materials, selecting agreeable X80 steel plates, controlling the grain size of the X80 steel plates at 11 grade or above; (2) blanking; (3) reel pipe spot welding, selecting agreeable welding rods the chemical compositions and mechanical properties of which are equivalent to or slightly higher than those of a parent material, controlling the interlayer temperature within 200 DEG C, the current between 160A and 190Aand the voltage at 30V; (4) flattening; (5) hot press moulding, controlling the heating temperature within 930 DEG C and the temperature of workblank in a furnace lower than 600 DEG C; (6) opening holes for drawing, trimming and shaping and detection; (7) hot treatment, putting welding seams at the same heated layer when a plurality of parts are simultaneously treated in a furnace; and (8) surface cleaning, end part processing and finished product detection. The technical process selects the raw materials with agreeable chemical compositions, reduces the current and the voltage, improves the welding speed and reduces the heat quantity during processing procedures, thus preventing the augmentation of grains and meeting the requirements of the X80 steel plate hot extrusion tee.