The invention belongs to the technical field of a caustic soda production technology, and particularly relates to a salt dissolving tank and a device for the caustic soda production technology. The salt dissolving tank for the caustic soda production technology comprises a tank body, a salt guiding barrel, an overflow groove and a salt water distributor located below the salt guiding barrel, wherein the salt guiding barrel is arranged in the middle of the tank body, the salt water distributor is connected with a water source and comprises a circumferential distribution pipe arranged along theinner circumference of the tank body and radial distribution pipes arranged in the radial direction of the circumferential distribution pipe, and multiple water outlets are uniformly distributed in the circumferential distribution pipe and the radial distribution pipes. With the adoption of the salt dissolving tank for the caustic soda production technology, the salt dissolving speed is higher, salt water concentration is qualified, and crude salt is prevented from being accumulated at the bottom of the salt guiding barrel.