The invention belongs to a temperature measurement technology and particularly relates to a formula of a novel temperature-sensitive coating for temperature measurement and a coating preparation method. The preparation method comprises the steps as follows: mixing a phenylacetylene monomer, tetrabutyltin and tantalum pentachloride in a certain ratio in a toluene solvent for synthesizing and dissolving out a polyphenylacetylene solid, and dissolving the polyphenylacetylene solid in toluene in a certain ratio to obtain the coating. The obtained coating is easy to spray and good in film-forming quality, has excellent temperature response characteristic, and is good in temperature resistance, the highest tolerable temperature is not lower than 300 DEG C, and the requirement of high temperature measurement is well met; meanwhile, the proportioning is simple, convenient and quick, the cost is low, and large practical value is realized.