Abstract: In this paper, the numerical simulation method was used to study the negative pressure distribution of the gas collecting structure of the electrolytic cell, which not only reduced the R&D cost, shortened the R&D cycle, and improved the R&D efficiency. By comparing with the actual operation data, it was found that the simulation results were very consistent with the actual operation data, and the deviation of each parameter was within ±8%. Therefore, the use of numerical simulation meant to carry out the electrolytic cell optimization and improvement had a very important significance.