The growth of petroleum prices on the world’s market within the recent years has raised the cost of synthetic chemical products and, respectively, has enhanced the competitiveness of the products, including also acetic acid, which can be obtained from plant biomass. Acetic acid is currently produced mainly by way of fermentation of alcohol-containing solutions, and only a small part is obtained from wood dry distillation products. However, already in the immediate future, owing to the new state of the art in the petroleum market, the overall production of furfural and acetic acid applying the hydrolysis technology, will grow. Therefore, all studies along these lines, including also acetic acid formation from straw, become increasingly urgent, since this raw material is formed in great quantities worldwide, and it has not yet found regular utilization. In the present work, the kinetics of the formation of acetic acid from wheat straw was investigated. The obtained data can be used to develop a new technology for obtaining acetic acid.