The invention belongs to the technical field of fire-resistant containers and particularly relates to a slope surface buffer tundish which comprises a steel casing, a fiber felt layer arranged in the steel casing, a permanent pouring layer arranged in the fiber felt layer and a coating layer arranged on the surface of the permanent pouring layer. A plurality of intrusive water gaps and impact plates are arranged in the slope surface buffer tundish, a protective plate and a slag blocking wall are arranged above the impact plates respectively and are oppositely disposed, the slag blocking wall is located between the impact plates and the intrusive water gaps, and the surfaces of the impact plates are slope surfaces. On the basis of an existing tundish, the impact plates are further modified; on one hand, the streamline structures of the impact plates are increased, the service lives are prolonged; the thinking of the impact plate modularization is further provided, and the impact plates can be subjected to modularized integral replacement. The slope surface buffer tundish is convenient to replace and operate and production efficiency is improved.