The invention provides a process for preparing fresh 
momordica grosvenori decolored concentrated juice. The process comprises the following steps: saccharifying fresh 
momordica grosvenori, selecting and washing 
momordica grosvenori, crushing, performing 
percolation extraction, performing disc-type 
centrifugation, performing micro-
filtration clarification with a 
ceramic membrane of 0.45mu m, performing molecular weight ultra-
filtration separation, performing decoloring with a 
polyamide resin, performing decoloring with a decoloring resin, adjusting the pH value with a cationic resin, concentrating with a 
reverse osmosis membrane, removing residues with a 
granular activated carbon column, performing micro-
filtration clarification with a 
ceramic membrane of 0.22mu m, performing vacuum concentration so as to obtain an ointment, sterilizing, and performing vacuum packaging, so as to obtain the fresh 
momordica grosvenori decolored concentrated juice. The 
flavor and the 
nutrient components of fresh 
momordica grosvenori of the fresh 
momordica grosvenori decolored concentrated juice produced by using the process are maintained, and the juice is nearly colorless and is clear and transparent, is very good in taste, free of after precipitate and high in quality, can be widely applied to food, drinks, medicines and healthcare products, and is simple in production process, advanced in technique, high in 
automation degree, high in efficiency, low in 
energy consumption, low in production cost, stable in product quality and high in quality.