The utility model discloses a fishing tool for a small-diameter packer. The fishing tool can be used for fishing the packer in a small cased well in the petroleum industry and a pipe column hung by the packer. The fishing tool comprises an upper connector and a fishing barrel, internal threads on the lower portion of the upper connector are connected with a mandrel, the upper portion of the fishing barrel is connected with the mandrel through a guide pin, the lower portion of the fishing barrel is a petal-shaped barrel body provided with an axial dividing groove, fishing threads are arranged on the outer circle of the petal-shaped barrel body, and a center hole of the mandrel is communicated with a center hole of the upper connector. The central hole of the tool is a flushing water hole, the upper connector has the functions of a connector and a reducing function, and meanwhile, the upper connector has a centralizing function due to enough wall thickness. According to the utility model, the tensile strength and the fatigue resistance are improved, the movable fishing tubular column can be repeatedly lifted and lowered for multiple times in the fishing and jam releasing process, andthe tool performance is not influenced.