The invention relates to a controllable and safe PLA/PCL (polylactic acid/polycaprolactone) composite human body piping support and a preparation method thereof. The support is of a mesh pipe structure formed by weaving of PLA/PCL blended monofilaments. The preparation method comprises the steps of 1, conducting blended pelleting on a PLA material and a PCL material to obtain blended slices, and drying the blended slices; 2, conducting melt spinning on the blended slices to obtain primary monofilaments, and conducting drawing to obtain blended monofilaments; and 3, weaving the human body piping support which is of a mesh pipe structure by means of the blended monofilaments on a mold in the way of making each monofilament intersect with adjacent monofilaments, conducting heat setting, and taking down the mesh pipe support after cooling to obtain the human body piping support for clinical use. The piping support has high mechanical property and biocompatibility, the defect that permanent foreign matter can be formed in the body by metal materials is overcome, and the preparation method is simple and suitable for industrial production.