The invention discloses a pump pipe buffer for transmitting concrete, relating to a construction instrument. In the buffer, an upper flange plate is arranged on an pipeline interface below an upper pipeline bayonet; an upper impact socket is arranged below the upper flange plate; an upper buffer block is arranged outside the upper impact socket; a lower flange plate is arranged on a pipeline interface above a lower pipeline bayonet; a lower impact socket is arranged above the lower flange plate; a reversed opening is processed at the top of the lower impact socket; the upper impact socket is inserted and combined with the lower impact socket movably; a lower buffer block is arranged outside the lower impact socket; and the upper flange plate, the lower flange plate, the upper buffer blockand the lower buffer block are tightly fixed through a plurality of springs and bolts. By utilizing the self structural characteristics of the pump pipe buffer and by adopting the flexibility soft connection, the pump pipe of the invention lowers noise, avoids the damage to the finished product concrete of each floor caused by the displacement of the pump pipe, reduces the displacement amount of the pump pipe, prevents a formwork from displacement, is convenient for reinforcing and stabilizing the pump pipe and a concrete mixing machine, and has the advantages of simple structure, simple, convenient and feasible operation and use, and high working efficiency and the like.