The invention discloses a plastic pipe coating machine head and a plastic pipe coating device including the plastic pipe coating machine head. The plastic pipe coating machine head comprises a machine head body, a pipe guiding cylinder and a guiding plate, wherein the guiding plate is of a disc shape with a central round hole; an annular channel is arranged at the outer side surface of the guiding plate along a peripheral direction; a plurality of sub-channels extending from the outer side surface of the guiding plate to the inner side surface of the guiding plate are arranged on two end faces of the guiding plate; the sub-channels is tangential to the periphery of the central round hole; and a main channel is communicated with the sub-channels through the annular channel. The plastic pipe coating machine head is simple in structure; additional power is not needed, thus the energy consumption is reduced, the problems of pipe rotating and leakage are avoided, the waste of raw materials is avoided, and the fault rate of equipment is further reduced. The invention further provides the plastic pipe coating device. Multiple modified layers with different functions are coated on the external surface of a pipe to prepare a plastic pipe of a multi-layer structure.