A pipe machine nose with a choke device comprises a compression plate, a nozzle mould, a nose body, a distributing bush, a distributor support, a distributor and an inner connector and is characterized in that the compression plate and the inner connector are connected to two ends of the nose body, a filter mesh plate is disposed at one end of the inner connector, a buffer mandrel is disposed at a center axis of the nose body. A choke mandrel is disposed at one end of the buffer mandrel, and the outer wall of the buffer mandrel, close to the end of the choke mandrel is provided with at least one circular groove. The outer wall of the choke mandrel is provided with at least one circular projection, and the other end of the chock mandrel is connected with the distributor. A cavity is formed between the nose body and the buffer mandrel, choke mandrel and distributor. The nozzle mould, the distributing bush and the distributor support are sequentially connected and are located in the cavity. Compared with the prior art, the pipe machine nose is provide with the buffer mandrel having the circular grooves, so that performance of plasticizing materials is improved and welding marks generated on the distributor support are eliminated.