The invention discloses a feed pipe for a self-evaporator in a digestion system and the self-evaporator with the feed pipe. The feed pipe for the self-evaporator in the digestion system comprises a pipe body, a small flange, a flange cover, a taper pipe, and a first hard alloy layer, wherein the an inlet end is arranged at a first end of the pipe body, an end plate is arranged at a second end of the pipe body, and a nozzle is arranged adjacent to the second end; the small flange is arranged on the end face of the first end of the pipe body; the pipe body is sleeved with the flange cover adjacent to the first end; the pipe body is sleeved with the taper pipe and the first end is connected to the end face of the second end of the flange cover; and the first hard alloy layer is arranged on the internal wall of the pipe body. According to the embodiment of the invention, the feed pipe for the self-evaporator in the digestion system has the performances of high temperature resistance, alkali resistance, high pressure resistance and wear resistance, so that the service cycle of the feed pipe for the self-evaporator in the digestion system and the running rate of the unit of the digestion system are improved.