A cage for trapping hybrid tilapia comprises a rebar framework, wherein the outer side surface of the rebar framework is wrapped with meshes to form a cage body; the cage body is round; a fish inlet and a fish storage bag inlet are formed in hole parts of two ends of the rebar framework wrapped with the meshes; the hole part in the rear end of the rebar framework is connected with a fish storage bag; two teel bar made supporting rings are arranged in an inner cavity of the fish storage bag and used for supporting an inner space of the fish storage bag; the fish storage bag extends to a binding rope of a fish getting hole; steel bar inverted whiskers are mounted on the fish getting hole and fixed by the meshes; inner inverted whiskers are connected to the fish storage bag inlet, extend inwards and are connected with an inner inverted whisker hole; and the inner inverted whisker hole is fixed by inner inverted whisker hole pull ropes.