In order to study the influence of hail disaster on the stability of soil slope， a set of hail falling device was designed independently and the model slope was loaded with self-made ice balls. Three groups of tests were carried out in this paper. The earth pressure was obtained through a high-sensitivity dynamic earth pressure monitoring system， and the impact force was fitted. Particle Image Velocimetry （PIV） was used to monitor the velocity vector change when the puck impinged on the slope， and the normal and tangential restitution coefficients were calculated. At the same time， the displacement change law during the loading process was monitored. The moisture content of slope was monitored by a moisture content monitoring system， and the rule of the water migrating before and after the test was analyzed. The experimental results show that when the loading density and loading times are large， the impact causes shallow sliding of the slope， and the ice puck on the top surface of the slope can redistribute and form accumulation， gradually melt， and form seepage downward. The impact load is formed instantaneously after loading， and it can be fitted as a decaying half-sine waveform. The normal recovery coefficient is small， and the tangential recovery coefficient is large. The puck tends to move along the slope during impact. The water content sensor responds sequentially from top to bottom， the melt water seepage velocity at the rear end of the slope is faster than that at the front end， and water mainly affects the slope top platform. The middle layer of the slope top platform has the fastest water migration speed. The static earth pressure is directly related to the load on the slope top and the seepage of the ice ball melting. The overall deformation of the slope is small， and the maximum deformation is located at the corner of the top of the slope. The experimental results reflect three aspects of the influence of hail falling on slope stability： impact， stacking and infiltration， which can provide a reference and basis for slope safety warning under the condition of extreme snow and ice disaster.