The utility model belongs to the non-ferrous metal smelting and casting industry, and discloses an argon protection device for electroslag remelting. The problems existing in electroslag remelting smelting in the prior art are solved. The device comprises a tank body arranged at the top of a crystallizer, a movable protective cover is arranged at the top of the tank body; a guide ring is fixedly arranged at the lower part of the inner wall of the tank body; the guide ring is positioned at the top of the crystallizer; a guide ring gland is arranged at the top of the guide ring; an annular air guide groove is formed in the upper portion of the inner side of the flow guide ring in the circumferential direction. A plurality of air outlet holes are uniformly formed in the bottom of the annularair guide groove; the air outlet is communicated with the cavity of the crystallizer; the outer side of the flow guide ring is provided with a horizontal gas inlet groove, one end of the gas inlet groove is communicated with the annular gas guide groove, the other end of the gas inlet groove is communicated with a gas inlet hole formed in the tank body, and the gas inlet hole is connected with anargon pipe. The gas inlet device is simple in structure, low in manufacturing cost, easy to assemble and disassemble, long in service life and particularly suitable for small electroslag furnace smelting.