The invention discloses a test tube rack. The test tube rack comprises a bottom plate, wherein upper support rods are symmetrically arranged at the two ends on the top surface of the bottom plate in the length direction of the bottom plate; horizontal plates are fixed at the tops of the upper support rods and are provided with test tube insertion holes; test tube supporting holes which have the same diameters as the test tube insertion holes and correspond to the test tube insertion holes are formed in the bottom plate; a bearing slot fit with the bottom of each test tube is formed in the bottom surface of the bottom plate, corresponding to each test tube supporting hole; drain holes are formed in the bottoms of the bearing slots; support plates are arranged on the two sides of the bottom surface of the bottom plate respectively along the length direction of the bottom plate; a water receiving sink is connected on the support plates in a sliding manner. Test tubes are inserted into the test tube insertion holes or are placed on sleeve rods upside down, water on the walls of the test tubes flows to the bottom plate along the test tubes and then flows into the water receiving sink via circular holes or drain holes, and then users only need to pour the water in the water receiving sink away periodically, thus effectively preventing the water on the test tubes from flowing to a table top and wetting the table top.