Provided is a centrifugal sand pump shaft including a pump shaft, a shaft sleeve, and a plurality of flat keys. The tail end of the pump shaft is movably connected with the shaft sleeve, a plurality of opposite-opening keyways are arranged in the shaft sleeve, flat keyways cooperatively used with the opposite-opening keyways are arranged in the pump shaft, and any one of the opposite-opening keyways is fixed to the corresponding flat keyway via one of the flat keys. The shaft sleeve is threadedly connected with the pump shaft. The centrifugal sand pump shaft is advantageous in being simple in structure and convenient to use, being capable of achieving the aims of enhancing the hardness without the need for chrome-plating a shaft member, preventing the environment from being polluted by the chrome plating technology, being convenient for maintenance and reducing the production cost.