The optimum application of humic acid fertilizer to promote the growth and yield of adzuki bean was discussed by applying different amounts of humic acid fertilizer, which provided theoretical basis for the application of humic acid fertilizer in the field production of adzuki bean in Liaoning Province. The results showed that the plant development trait values under 15 g/m² humic acid fertilizer treatment, leaf area index, leaf number, stem diameter,root dry weight, stem dry weight, leaf dry weight, petiole dry weight, root length, root surface area and root volume were higher than those under 15 g/m² and 20 g/m² humic acid fertilizer treatment. The treatment of 15 g/m² humic acid fertilizer was most suitable for the growth and development of adzuki beans, and the yield was the highest. Applied 20 g/m² humic acid fertilizer inhibited the various traits of adzuki bean plants, and the amount of 5 g/m² humic acid fertilizer was insufficient. The best application of humic acid fertilizer to promote the growth and increase of Liaoning adzuki bean is 15 g/m².