The invention relates to an automatic uniformly mixing apparatus of a chemical test tube. The automatic uniformly mixing apparatus consists of a controller, a gas generation apparatus, a ventilating pipe, gas filter membranes, a gas distributing apparatus, a test tube clamping apparatus, a conveyor platform, a spring, an electromagnet, a gas separation plate and a test tube closing sleeve, and is characterized in that the controller is fixedly connected with the gas generation apparatus; in order to increase the response speed of the gas generation apparatus, the controller selects a DSP as a control chip, and one end of the ventilating pipe is connected with the gas generation apparatus; in order to guarantee the purity of the gas for the liquid, three layers of gas filter membranes are particularly installed in the ventilating pipe, and the gas distributing apparatus is fixedly connected with the other end of the ventilating pipe; and after the test tube clamping apparatus moves to be right below the gas distributing apparatus on the conveyor platform, the test tube clamping apparatus is controlled by the controller to automatically stop and to carry out the uniformly mixing operation of the test tube. The automatic uniformly mixing apparatus has the beneficial effect that an automatic uniformly mixing function of the chemical test tube is realized.