The present invention relates to a method of preparing watermelon juice or concentrates thereof using watermelon, and more specifically, in the process of processing fruit and vegetable juice, in general, the grinding and compressive juice methods have been used. The present invention relates to a watermelon juice concentrate obtained by selectively separating one by one using plant cell separation enzymes and a method of preparing watermelon juice.;According to the present invention, various nutrients, flavors, colors, and the like can be obtained by selectively decomposing only insoluble pectin, which binds plant cells to cells using protopectinase, without juice or crushing watermelon. The object of the present invention is to maintain the original taste of watermelon juice by heat treatment or keeping it at room temperature for a long time.;Therefore, the present invention is to remove the skin of the watermelon and cut the flesh to prepare watermelon juice, 0.01 ~ 0.15% plant cell separation enzyme to the weight of the flesh of the peeled watermelon, 30 ~ 50 ℃ 30 in a reactor After stirring for 3 minutes, the reaction is filtered through a sieve of 10 to 30 mesh (mesh), characterized in that the production method of watermelon juice concentrate or watermelon juice using the watermelon juice solution from which the seeds are removed.
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