The invention discloses a high-protein meal replacement food and a processing method thereof, wherein the meal replacement food is made of the following raw materials by mass ratio: 30 to 42 parts ofprotein powder, 4 to 12 parts of plant source-type powder, 0.1 to 1 part of a taste-improving powder raw material, 0 to 3 parts of other powder raw materials, 20 to 35 parts of a sugar material, 5 to15 parts of an oil material, 2.5 to 5.0 parts of glycerin, 0.1 to 1 part of salt, 0. 3 to 3 parts of drinking water, 0 to 10 parts of other non-greasy liquid or paste materials, 5 to 15 parts of solidparticles, and 0 to 0.5 parts of liquid food essence. The method controls the powder/syrup ratio, and controls the quality problem of the product from the source of the technology; the meal replacement prepared according to the ratio and the process is easier to mold, and the mouthfeel is more comfortable. Different protein sources supplement the needs of various protein/amino acids for the consumer; high-quality dietary fiber ingredients such as chia seeds can be added to increase satiety after eating; and the application scope is wide.