Under the background of market decline and increasing competition, how heavy-duty commercial vehicle enterprises enhance their brand competitiveness has become an important factor in determining their sustainable development. The paper first builds the evaluation index system of heavy commercial vehicle brand competitiveness from the four dimensions of market competitiveness, brand expression, technology control and sales service force, and builds the mathematical evaluation model by using analytic hierarchy process and standard normal distribution curve. Then the paper choose three domestic representative heavy commercial vehicle brands such as Shaanxi Auto, Dongfeng and Hualing to carry out the empirical evaluation research and carry out PEST analysis on the development of heavy commercial vehicles under the new normal based on the results of empirical evaluation. Finally, from the aspects of technology, management, marketing and other aspects, the article put forward countermeasures and suggestions to enhance the competitiveness of heavy commercial vehicles brand.