The present invention is directed to devise a juice extractor, The juice extractor 1 according to the present invention includes a helical spindle 6 connected to a power driven source 5, a housing 2 having an inlet 3 in the upper part and an outlet 4 in the lower part, a fine grinding portion 35c and a refine grinding portion 35d, at the end part of the helical spindle 6, a drum cap 10 which includes endurable bushing element 9, for the detail structure of the drum cap 10, a thread tube 15 formed to the lateral direction to join with a pressure control cap 16 which has a squeezing flange 17 formed on the inner part of the circumference so as to press a circular protrusion 13 of the bushing element 9 in order to control the optimum squeezing pressure and provide the best squeezing force and maximize the effectiveness of the compression of foodstuff such as fruit or vegetable.