The utility model discloses a plastic neon lamp, which comprises a core wire, a transparent sheath coated on the core wire and a plurality of luminous bodies arranged inside the core wire. The utility model is characterized in that a cavity is arranged inside the core wire, and the luminous bodies are arranged inside the cavity; the luminous bodies are composed of a plurality of luminous bulbs arranged on an integrated circuit board; the bottom of the cavity forms a plane, and both sides of the bottom of the cavity are respectively provided with a groove in the axial direction of the core wire. The plastic neon lamp of the utility model has the advantages of favorable integral decorative effect, less using amount of materials and low cost.