The invention discloses a wear-resistant engineering plastic and a preparation method thereof. The wear-resistant engineering plastic is prepared from, by weight, 65-75 parts of unsaturated polyester,60-80 parts of polyethylene glycol terephthalate, 15-35 parts of semi-aromatic nylon PA6T, 10-12 parts of polytetrafluoroethylene, 10-20 parts of potassium titanate whisker reinforcement, 3-5 parts of a butyl tin mercaptide stabilizer, 1-5 parts of an additive, 0.6-1.8 parts of a coupling agent, 0.2-0.5 part of an antioxidant and 0.7-2.5 parts of a lubricant, and the lubricant is one or a composition of more of liquid paraffin, polyethylene wax and glyceryl monostearate. The invention relates to the technical field of engineering plastic products. The raw materials in the wear-resistant engineering plastic and the preparation method thereof are reasonably proportioned, the prepared engineering plastic is remarkable and durable in wear-resistant effect, excellent in mechanical property andbetter in effect of being matched with a polytetrafluoroethylene coating for use, and after the engineering plastic is prepared into engineering parts, the loss of the engineering plastic is small, and the performance change is small in a complex working environment.