The invention discloses an electrolytic bath capable of realizing automatic matching and used for sodium bromate production and relates to the technical field of electrolysis. The electrolytic bath comprises a base, a case and an electrolytic bath body, wherein the top of the electrolytic bath body is movably connected with a box cover, the top of the base is fixedly connected with the bottom of the case, the top of the case is fixedly connected with the bottom of the electrolytic bath body, a power box is fixedly connected between the top of the base and the right side of the case, and a piston cylinder is fixedly connected with the top of the power box. According to the electrolytic bath capable of realizing automatic matching and used for sodium bromate production, three partition boards are arranged in the piston cylinder to divide the inner space into 1.5:2:1, an electrolysis aid, an organic stabilizer A and an organic complexing agent B can be drawn simultaneously through cooperation of three liquid inlet pipes and liquid outlet pipes, drawing can be performed according to required proportion, the mixture is discharged into the electrolysis bath body after being mixed by a mixing box, a complex step of matching materials in proportion in advance is omitted, the processing efficiency is improved, materials are added strictly in proportion, and the electrolysis efficiency is guaranteed.