The invention discloses a water bag type corundum sand roller. One sand roller comprises a sand roller main body and a single-layer rubber water bag, wherein an annular metal water pipe is sleeved in a spindle and is connected with a water inlet inner hole and a water outlet inner hole on the spindle to form the sand roller main body; and the single-layer rubber water bag is sleeved on a double-end inner sealing plate from one end of the spindle and is fixed by an outer pressure sealing plate. The other sand roller comprises a sand roller main body and a double-layer rubber water bag, wherein an annular metal water pipe is sleeved on a spindle and is connected with a water inlet inner hole and a water outlet inner hole at the two ends of the spindle; the spindle connected with the annular metal water pipe passes through a seamless steel pipe; a double-end metal cover plate is sleeved in the spindle, and is welded with the spindle and the seamless steel pipe respectively to form the sand roller main body; and the double-layer rubber water bag is sleeved on the sand roller main body and is sleeved with a sand barrel plated with corundum. The invention has the advantages that: the sand roller has long service life, low comprehensive cost which is 1/3 to 1/4 of the cost of the conventional sand belt, and low installed power which is 1/2 of that of the conventional sand machine, and is convenient to replace.