The utility model discloses a three-coordinate universal jig which is provided with screw thread positioning holes that are uniformly arranged on a base. One end of each support bar is tapped with screw thread and the other end is a precision shaft. The support bars can be equipped in the positioning holes of a base through screw thread. An elastic pressing plate can be sleeved into the precision shaft end of the support bar through a circular hole with an inclined end. A thread plunger and an elastic plunger can be fixed to a bottom plate through the bottom threads. The adjustable clips are sleeved into the support bars through threaded holes. The bottom end of a nylon support and a plumb bob support can be randomly combined and mounted with a height-adjustable support, support column and magnetic support. A universal joint can be matched with the height-adjustable support, support column and magnetic support through the threaded hole. A sliding supporting block and a fixed supporting block can be sleeved into the precision shaft end of each support bar for matching with the support bar. The three-coordinate universal jig has the following advantages: accurate repeated positioning, convenient mounting, etc. A plurality of products and the product with complicated geometrical shape can be clamped.