Lettuce micro-powder preparation technology

A lettuce micro-powder preparation technology comprises the following steps: 1) using fresh lettuce as a raw material, removing impurities, cleaning, sending cleaned fresh lettuce into a fresh-keeping storehouse of 3-5 DEG C and draining off surface moisture; 2) carrying out tumbling treatment by sending the lettuce into a tumbling machine while vacuumizing every 5-8 minutes and tumbling for 5-10 min after each time of vacuumizing, vacuumizing, and cycling the process for 2-4 times; 3) juicing the tumbled lettuce and collecting the lettuce juice; 4) injecting the lettuce juice and water according to the weight ratio of 100:10 into a stainless steel heating pot, diluting the lettuce juice, and sealing the stainless steel heating pot; 5) heating the raw material through the stainless steel heating pot and stirring until the temperature reaches 25-35 DEG C, injecting brown sugar water, continuously carrying out heat-preservation stirring for 60-65 min; and 6) carrying out drying process on the heated liquid substance by a spray drying mode so as to obtain a solid substance, and ball-milling the above solid substance through a ball mil to 400 meshes so as to prepare the lettuce micro-powder.