The invention provides a spraying device of a dish washing machine. The spraying device comprises a first sprayer and a second sprayer, wherein the first sprayer comprises a first water storage cavity and a first spraying surface; the second sprayer is rotationally arranged on the first spraying surface; the second sprayer is a quadrilateral sprayer, and comprises a second water storage cavity, a second spraying surface and a plurality of second spraying holes; the second spraying holes are formed in the second spraying surface, and are communicated with the second water storage cavity; the first water storage cavity is communicated with the second water storage cavity. The spraying device has the advantage that the second sprayer is the quadrilateral sprayer, so that the distribution of sprayed water flow is more uniform, the blind area of washing is reduced, the effective washing area is increased, and the washing efficiency of the spraying device of the dish washing machine is greatly improved.