In order to study the mechanism of sugarcane leaf sheath stripping using elastic dentation typed stripping element, the experiments of three-dimensional dynamic hitting force were conducted under the action of elastic dentation on sugarcane stalks. The specialized test bench was designed to fix the stalk at opposite ends by using two fixed components, and one way type piezoelectric impact sensors were respectively fastened on each fixed component. An elastic dentation driven by the rotating roller hit the middle of the stalk, and the dynamic hitting forces were measured in real time by sensors. After data processing, the maximum values of Fx, Fy and Fz in longitudinal, transversal, and tangential directions were obtained. Four factors including rotate speed of roller, interleaved depth and lateral offset distance between the elastic dentation and stalk, and material of elastic dentation were determined. Single factor experiments were carried out to analyze the effect of factors and obtain the maximum values of dynamic hitting forces in three directions with the optimal parameters combination. The formula of maximum failure force of leaf sheath stripping was deduced and the mechanical model of leaf sheath striping was established which combined with material mechanics properties and leaf sheath stripping criteria. The results showed that the tested maximum values of Fx and Fy were equaled to 93.87N and 138.26N which were greater than the maximum failure force of leaf sheath in x and y directions, 76.40N and 53.53N simultaneously, under the condition that the rotate speed of roller was 700r/min, the interleaved depth was 30mm, the lateral offset distance was 20mm, and the material of elastic dentation was polyurethane with shore hardness 85HA.