The invention provides a method and a device for bean sprout mass production cultivation. The method includes seed selection, seed soaking, cultivation and harvest. The cultivation process further includes that seeds are placed into cultivation boxes, and a plurality of cultivation boxes are stacked to be vertical-shaped. The plurality of cultivation boxes stacked are placed into a cultivation room, the seeds are watered at regular time, and when watered, each seed is fully supplied with water. The seeds grow naturally, any growth agent is not necessary to be added, and healthy bean sprouts of mass production can be harvested. The cultivation device comprises a cultivation box and a cover plate, the cultivation box comprises a ventilation hole, a linear hole, and an overflow tube, wherein the ventilation hole is used for adjusting the temperature in the cultivation box, the linear hole facilitates water discharging, the situation that the cultivated seeds are rotted due to water accumulation can not happen, holes can be prevented from being blocked, and the height of the overflow tube is designed to be one third shorter than that of the circum of the cultivation box so that redundant water can be discharged when water is added. The cover plate is provided with symmetrical handles so as to be picked up favorably in a balanced mode, a round hole is formed in one of the handles, the overflow tube can penetrate through the round hole, and therefore an optimized growing environment is provided for the cultivated seeds.