A Helicobacter pylori staining solution and a staining method thereof, the staining solution is composed of the following raw materials: 6-18mg / mL methylene blue, 3-9mg / mL sodium borate, and the rest is distilled water, with the mass-volume ratio mg / mL as the unit. In the present invention, the sample tissue section is immersed in the above-mentioned Helicobacter pylori staining solution and dyed for <10s; the stained sample section is washed with running water, and then soaked in 95% ethanol, absolute ethanol, n-butanol, xylene, dehydrated, and dehydrated Afterwards, it was wet-sealed with neutral gum to obtain the stained slide sample; HP in the stained slide sample was observed under a microscope, and the diagnosis and interpretation of HP was performed according to the "China Chronic Gastritis Consensus (2017, Shanghai)". The present invention replaces boric acid with sodium borate to prepare methylene blue dye solution for staining Helicobacter pylori, significantly shortens the dyeing time, has the advantages of saving time and labor, deep bacterial color, easy microscopic examination and the like, and meets the diagnostic standard.