Vacuum preheating electron beam welding device of pressure-resistant shell

The invention relates to a vacuum preheating electron beam welding device of a pressure-resistant shell. The vacuum preheating electron beam welding device comprises a vacuum electron beam welding machine, a heating system, a temperature control system and a cooling system, wherein the pressure-resistant shell is arranged above a rotary table inside the vacuum electron beam welding machine, the heating system comprises an inner heating device and an outer heating device, and the inner heating device and the outer heating device heat the inner side and the outer side of the pressure-resistant shell; and the water cooling system comprises a water cooling pipeline, a water cooling coil and a water cooling device, circulating cooling water is introduced into the interior of the water cooling system, the water cooling coil is arranged above the rotary table and tightly attached to the rotary table, and the water cooling coil is used for guiding out of heat energy in the vacuum chamber, so that components in the va