The present invention discloses a packaging method for a (2+1) * 1 side fused taper type fiber pumping beam-combining device. A prepared product comprises a substrate, and the substrate is provided with a concave groove. A signal optical fiber is arranged in the concave groove along the direction of the concave groove. Two pumping optical fibers are laid in parallel on the signal optical fiber. The pumping optical fibers and the signal optical fiber are connected as one piece through a fixed piece. The pumping optical fibers and the signal optical fiber are fixed as one piece through dispensing the adhesive in the concave groove. The fused ends of the pumping optical fibers are stretched tapered sections. The tapered sections are at a gradient relative to the fused end of the signal optical fiber after being fused. According to the packaging structure of the present invention, through three simple gluing procedures, the stray light that might cause the temperature rise is effectively derived. Meanwhile, the temperature rise point of the beam-combining device is effectively cooled, so that the thermal damage of the fiber pumping beam-combining device is avoided. Experiments prove that, the packaging method realizes the kilowatt-level pumping power tolerance capability.