The invention relates to a cage for entrapping freshwater yellowtails. The cage comprises a cage body framework, wherein the cage body framework is formed by welding reinforcing bar stand columns, a mesh interlayer is arranged in an inner cavity of the cage body framework, an opening is formed in the mesh interlayer, vertical reinforcing bar inverted whiskers are mounted at the opening, the lateral surfaces of the cage body framework is wrapped with mesh walls so as to form a rectangular cage body, four fish inlets are formed in all around at the upper part of the bottoms of the mesh walls for wrapping the cage body framework respectively, and each reinforcing bar inverted whisker is mounted at the corresponding four fish inlet; each reinforcing bar inverted whisker is fixed through the mesh wall, a stringer nose is arranged at one corner of the top of the cage body, and a fish taking door is formed in one side of the top of the cage body; one end of the fish taking door is fixed through a movable hinge, and a door hook is connected to the other end of the fish taking door; under the action of the door hook, the fish taking door can be opened and closed vertically, and a fish entrapping bag 7 is placed at the bottom of the cage body and is fixed through a pull rope of the fish entrapping bag.