The invention discloses a GXJ steel rubber waterstop connector box connection device used for connecting two connector boxes. The connection device comprises a female head component fixedly connected to the first connector box and a male head component fixedly connected to the second connector box. The connection end of the female head component is provided with an inserting groove and positioning holes which are formed in the direction parallel to the length direction of the first connector box. A first connection hole is formed in the female head component in the direction perpendicular to the length direction of the first connector box in a penetrating mode. The connection end of the male head component is provided with an inserting head matched with the inserting groove and a positioning pin matched with the positioning holes. The female head component is provided with a second connection hole corresponding to the first connection hole. The inserting head of the male head component is inserted into the inserting groove in the female head component. The positioning pin of the male head component is inserted into the positioning holes in the female head component. The male head component and the female head component penetrate through the first connection hole and the second connection hole through first fastening pieces to be fixedly connected. The first connector box is fixedly connected with the second connector box.