Test tube rack

The utility model discloses a test tube rack, which relates to the technical field of test instruments and is characterized in that the lower end of a support column is fixedly connected to the upper surface of a base, the upper end of the support column is fixedly connected with a fixed plate, a plurality of through holes are formed in the fixed plate, a slideway is arranged in the fixed plate, and a movable clamping plate is arranged in the slideway in a sliding manner and is perpendicular to the axis of the through holes; a baffle is fixedly arranged at one end of the sliding way, an elastic piece is arranged between the end, close to the baffle, of the movable clamping plate and the baffle, the elastic piece is in a compressed state, the end, away from the baffle, of the movable clamping plate is connected with an adjusting device, and a plurality of movable holes corresponding to the through holes are formed in the movable clamping plate. A clamping block is fixedly arranged on the inner side wall of eac