This paper utilizes the Liquefied Natural Gas (LNG) ship B-type liquid cargo tank as the primary research object to investigate the extent of liquid sloshing within the liquid cargo tank under the emergency stop braking condition, considering varying filling rates. In this multiphase flow problem, numerical simulation is carried out by using the Volume of Fluid (VOF) method to analyze the magnitude of the impact of liquid sloshing on the wall surface of the liquid tank in the B-type liquid cargo tank of the LNG carrier under the emergency stop braking condition, as well as the change of the impact of the liquid sloshing on the wall surface of the liquid tank under the conditions of different filling rates. The findings indicate that, under the emergency stop braking condition, the impact force of the fluid in the front head of the liquid cargo tank is significantly greater than that in the rear head. Additionally, the impact force of the liquid sloshing on the wall surface of the liquid tank under different filling rates exhibits a tendency to first increase and then decrease. The results of this research provide valuable guidance and reference for the design and calculation of the B-type liquid cargo tanks of the LNG carriers.