The invention discloses a high-strength wood-plastic composite material with an intelligent temperature-indicating effect, and a preparation method and application of thereof. A base material comprises the following raw materials in parts by mass: 30-40 parts of plastic, 50-60 parts of plant fibers, 2-8 parts of a plasticizer, 0.2-0.4 part of a silane coupling agent, 0.3-1.2 parts of an anti-agingagent, 1.5-5 parts of a temperature-sensitive color-changing agent and 3-15 parts of inorganic fibers, and the high-strength wood-plastic composite material with the intelligent temperature-indicating effect is prepared. In addition, the invention provides a novel surface decoration process-surface pyrography treatment of the wood-plastic composite material, so that the surface of a product is provided with various vivid, attractive, waterproof and scrub resistant textures or patterns, and the patterns have an effect of ink and washing paintings. Decoration performance and practicability of the product are well improved.