The invention discloses a method of extracting plant vessels from biomass material. The method comprises the steps of (1) weighing certain sodium hydroxide and sodium sulfite, adding into deionized water, and mixing well for full dissolution to obtain solution A; (2) adding plant leaves into the solution, and boiling on a heating stove for a certain time; (3) after boiling, washing repeatedly withdeionized water to obtain a product; (4) taking certain concentrated sulfuric acid solution with a measuring tube, adding deionized water, and mixing well to obtain solution B; (5) adding the productof step (3) into the solution B, performing ultrasonic treatment, extracting after ultrasonic to obtain massive biomass vessels. The method herein is suitable for acquiring massive high-purity biomass vessels; the method is simple, easy to perform, and low in cost.