In this study, the effects of attapulgite (ATP) on soil water movement and hydrodynamic parameters were investigated by adding different rates, i.e. 0, 10, 20, 30, 40, 50, and 60 g/kg, of ATP into the soil uniformly. The results indicated that soil infiltration rate was reduced and cumulative infiltration decreased with increasing ATP content. When the ATP content was increased, residual water content (θr) decreased, and saturated water content (θs) increased, the reciprocal value of air intake (α) increased, and the form factor (n) decreased. At the same time, soil water holding capacity increased with increasing ATP content. When unsaturated soil hydraulic conductivity, diffusivity and unsaturated soil water retention capacity were calculated according to the relevant parameters of the van Genuchten formula, unsaturated soil hydraulic conductivity, diffusivity and capacity of water all decreased with increasing ATP content. By fitting the unsaturated soil water diffusivity using the empirical formula, relatively high relevance was observed. In summary, adding ATP to the soil has some penetration-retarding effects, it can improve soil water holding capacity and reduce soil macropores, and can improve soil quality to some degree.