The invention discloses a driving sprocket wheel for an agricultural mini-tiller in the technical field of agricultural mini-tillers. The driving sprocket wheel comprises a sprocket wheel body; the front end surface of the sprocket wheel body is uniformly provided with connecting rods; one end of each connecting rod is provided with a fixing bolt; threaded holes are formed in the front end surfaceof the sprocket wheel body; the end, far away from the fixing bolt, of each connecting rod is provided with a soil shovel; the center of an inner cavity of the sprocket wheel body is provided with ashaft core; the rear end surface of the inner cavity of the sprocket wheel body is provided with a water tank; a water injection port is formed in the right side of the top of the water tank; a wateroutlet is formed in the top of the water tank; and sprinkling holes are uniformly formed in the wall body of the sprocket wheel body and between each two groups of wheel teeth. The driving sprocket wheel is simple in structure, convenient to operate and long in service life, the wheel teeth provided with grooves are uniformly arranged outside the sprocket wheel body so that the contact area between the sprocket wheel body and soil is increased; meanwhile, the digging depth of the soil shovels is controlled by the adjustable connecting rods; and also the water tank is additionally arranged, sothat water is sprinkled on soil as required.