The invention provides a pipe joint comprising a pipe cavity and a pipe wall. The pipe wall comprises an inner layer and an outer layer; a pipe to be connected can be inserted between the inner layer and the outer layer; the inner layer is a cucurbit pipe with an enlargement part; and the outer layer is a hard pipe. After the inner layer and the outer layer are machined separately, the exterior of the inner layer is sleeved with the pipe to be connected, and the outer layer is closely connected with the pipe to be connected. According to the pipe joint, the lining metal pipe is the cucurbit pipe, a smooth inner channel is guaranteed, deformation is not liable to occur, and the outer pipe is engaged with the pipe to be connected in a sealing mode.