The invention relates to low protein sorghum noodles special for patients suffering diabetes or nephropathy and a preparation method of the low protein sorghum noodles, and belongs to the technical field of agro-product processing. The low protein sorghum noodles comprise the following raw materials: 20-30 parts of sorghum flour, 10-15 parts of wheat flour, 10-15 parts of chickpea powder, 30-60 parts of wheat starch, 10-20 parts of pre-gelatinized starch, 0.8-1.2 parts of a thickening agent, 0.1-0.3 part of composite phosphate, 0.3-0.5 part of table salt, 0.1-0.3 part of carbonate, 0.1-0.3 part of edible alcohol, and 0.1-0.3 part of carboxymethyl cellulose calcium. The sorghum noodles prepared by the method disclosed by the invention increase the variety of low protein staple foods, richen the food and the drink of the patients suffering from the diabetes and the nephropathy, can meet the requirements of the patients suffering from the diabetes and the nephropathy for a low protein diet, are high in absorption and utilization rate, and are long in quality guarantee period. Semi-finished flour products are prepared under different temperatures, so that the toughness and the ductility of the semi-finished flour products can be improved, and the sensing quality of the prepared noodles is good.