The invention discloses a graphene/liquid crystal synergetic enhanced thermoplastics pipe and a preparation method thereof. The graphene/liquid crystal synergetic enhanced thermoplastics pipe comprises the following components in parts by weight: 40-60 parts of high-density polyethylene resin, 30-40 parts of active nano powder, 1-2 parts of three-dimensional netted oxidized grapheme, 4-7 parts ofthermotropic liquid crystal, 5-10 parts of maleic anhydride grafted polyolefin, 0.5-2 parts of a lubricant, 0.5-0.9 parts of an anti-oxidant 1010, and 0.3-0.5 parts of a MB 218 anti-ultraviolet lightagent. A preparation method comprises the following steps: adding the materials in a high speed mixer for uniform mixing, performing granulation in a double screw extruder with a rotating speed as 30rpm and the temperature as 200 DEG C, and performing extrusion moulding at the temperature of 200 DEG C to obtain the graphene/liquid crystal synergetic enhanced thermoplastics pipe. The preparation method is simple, the graphene/liquid crystal synergetic enhanced thermoplastics pipe can be produced under condition that the current plastic pipe production technology is not changed, the method is convenient for popularization and application, and the circumferential tensile strength and heat-conduction coefficient of the prepared graphene/liquid crystal synergetic enhanced thermoplastics pipe are obviously increased by comparing with the common plastic pipes.