The present invention relates to a juice extractor. The juice extractor of the present invention includes: a main body including a drive shaft configured to be rotated; a housing mounted on the main body and opened at a top thereof, the housing including a juice outlet port and a draff outlet port which are formed at a lower end portion thereof in such a manner as to be spaced apart from each other; a cover mounted on the housing to cover the opened top of the housing, and including an inlet port formed at a side of an upper portion thereof; a mesh drum mounted inside the housing and opened at the top and bottom thereof, the mesh drum including a plurality of mesh holes formed on the sidewall thereof; a rotary brush mounted between an inner wall surface of the housing and an outer wall surface of the mesh drum and opened at the top and bottom thereof, the rotary brush including at least one brush configured to continuously sweep at least one of the inner wall surface of the housing and the outer wall surface of the mesh drum while being rotated; and a feed screw connected with the drive shaft of the main body so as to be rotatably mounted on the main body and disposed inside the mesh drum, the feed screw including one or more screw spirals formed on an outer surface thereof, wherein the feed screw includes a plurality of retaining slots formed on a lower circumferential bottom surface thereof and the rotary brush includes a plurality of engagement parts formed on an inner circumferential surface of a lower end portion thereof so as to extend inwardly from the rotary brush, so that the engagement parts of the rotary brush are engaged with the retaining slots of the feed screw to cause the rotary brush to be rotated together with the rotation of the feed screw.