A blood sample platelet uniform-mixing device for a blood analyzer includes a vortex oscillation device, the vortex oscillation device includes a fixing assembly, a rotating assembly and a vibrating assembly. The fixing assembly is used for fixing sample test tubes. The rotating assembly includes a rotating motor and a rotating disc. A rotating shaft of the rotating motor is connected with the rotating disc, the rotating disc is matched with the fixing assembly. A central axis of each of the sample test tubes fixed on the fixing assembly deviates from the rotating shaft of the rotating motor. The rotating assembly is used for rotating the fixing assembly and making a blood sample in each of the sample test tubes be in a vortex shape. The vibrating assembly is arranged on the fixing assembly.