Compound grain bean flour and preparation method thereof

The invention provides compound grain bean flour. The compound grain bean flour is prepared from the following components in parts by weight through compounding: 100 parts of corn flour, 50-100 parts of highland barley powder, 50-100 parts of buckwheat, 20-50 parts of lotus root powder, 20-30 parts of pumpkin powder, 20-30 parts of celery powder, 10-20 parts of a tomato extract and 50-80 parts of sea-buckthorn powder. The sea-buckthorn powder is prepared by the following method comprising the following steps: crushing the sea-buckthorns and pouring the crushed sea-buckthorns into a pot; adding 75-degree alcohol and hydrolyzing for 1-2 hours under the condition of 85-95 DEG C; filtering to obtain a filtrate, centrifuging and dehydrating; pouring a dehydrated product into a bottle and heating and concentrating to obtain a concentrate; and drying the concentrate by infrared ray at 120 DEG C until the concentrate is made into powder.