The invention discloses a different-strength bearing roadway-beside filling body of a gob-side entry under a coal mine, which is characterized in that a gangue wall built by gangue bags (width: 1.5 to 2.0 meters) and a paste filling body (width: 1.5 to 2.0 meters) are closely combined so as to form a roadway-beside filling body made of different-strength materials by way of coupling; after a waterproof cloth is hung on the inner side of the gangue wall, a fixed die plate is used as the lower support of the paste filling body, and a temporary die plate is arranged as the upper support of the paste filling body, then the paste filling materials are filled into the die plates so as to form the different-strength bearing roadway-beside filling body after the filled paste filling materials are solidified. In the invention, a different-strength coupling roadway-beside filling body is formed by using the gangues and the roadway-beside filling bodies produced in the process of producing a working surface, which simply uses paste cementing material filling bodies, and can significantly reduce the pressure bore by the original roadway-beside filling body, and relieve the roof settlement of the floor bulge so as to adapt to the motion of rocks around the roadway better and obtain a better gob-side entry effect, meanwhile, the produced gangues can be digested in situ, and the economic benefits and environmental benefits can be obtained.