Abstract: In simulated wet desulfurization slurry flow environment, the effect of impact angle of NaCl solution+quartz sand acid slurry with sample impact surface on the erosion behavior of Cr30A high chromium cast iron was studied. The results show that the mass loss of the cast iron was relatively large under the interaction of corrosion and abrasion after the slurry impacted the cast iron at angles of 60° and 30°. The mass loss of the cast iron was relatively small after the slurry impacted the cast iron vertically, and the main cause of the mass loss was impact abrasion. The mass loss of the cast iron was the smallest after the slurry impacted cast iron parallelly, and the main cause of the mass loss was pitting. When the cast iron was subjected to the paralled impact of the slurry, its erosion mechanism was mainly micro-cutting. When subjected to the 30° angle impact of the slurry, the erosion mechanism was mainly cutting and plowing, and extrusion edges, impact pits and shallow flaky fatigue peeling existed on the cast iron surface. When subjected to the 60° angle impact of the slurry, the erosion mechanism was mainly deep material layer peeling and severe corrosion abrasion. When subjected to the vertical impact of the slurry, the erosion mechanism was mainly the shedding of surface material, accompanied by slight corrosion abrasion.