The invention belongs to the technical field of high-nitrogen steel smelting, and particularly relates to a method for smelting high-nitrogen austentite stainless steel through pressurized electroslag remelting gas nitriding. The method is characterized in that a consumable electrode base material with the nitrogen content being (0.75-0.9)x[%N] is smelted in a smelting furnace according to target steel grade ingredients, and the consumable electrode base material is forged into a consumable electrode; arcing slagging is conducted through a solid-state arcing method under protection of nitrogen; and nitrogen is led into a smelting chamber to increase the pressure to 1 MPa to 3 MPa, the cooling water pressure is synchronously increased, and smelting and feeding forming are conducted at a low smelting speed under the voltage ranging from 40 V to 45 V and the current ranging from 3000 A to 4200 A. The method has the beneficial effects that alloying of nitrogen in the high-nitrogen austentite stainless steel is efficiently conducted through the gas nitriding method by reasonably controlling the current, the voltage, the nitrogen pressure and other parameters, and the technical support is provided for development of the high-nitrogen austentite stainless steel high in nitrogen content, uniform in ingredient and excellent in performance.