In order to study the dynamic response and sloshing issues of liquid inside tanker truck during rear-end collision,the study focused on the collision between a truck and a tanker truck,and the smoothed particle hydrodynamics (SPH) method was used to explore the effects of relative collision velocity and filling ratio on the damage characteristics of the tank body.Meanwhile,the impact acceleration peak of the tank body and the variation of liquid sloshing force inside the tank were studied under four working conditions with filling ratios of 60%,70%,80% and 90% at three common relative collision velocities.The results show that the severity of tank damage increases with the increase of relative collision velocity and decreases inversely with filling ratio.When the maximum relative collision velocity is 60 km/h and the tanker truck is in an empty state,the maximum displacement and maximum stress of the tank deformation are both the largest,which are 64.19 mm and 545.5 MPa respectively.The peak value of tank collision acceleration and the sloshing impact force of liquid in tank decrease with the increase of liquid filling ratio.Among them,the most prone to failure parts are head T2 and partition plate G,and the maximum stress values are 357.8 MPa and 248.4 MPa,respectively.