A new sprinkler irrigation device suitable for square spray field has been proposed, in aim to solve the problems such as low uniformity coefficient of spray irrigation, irregular irrigation area and low accuracy of rocker arm in the process of rotation caused by the sprinkler with square spray field. The square spray field irrigation device mainly composed of control module, operating module and sprinkler. The spraying in square spray field is realized by adjusting the jet angle of sprinkler flow through the contact of the roller and spatial cam mechanism. The sprinkler irrigation uniformity is improved by controlling the angular velocity of rotation of sprinkler with microcontroller. Under the operating pressure of 0.20 MPa and the capacity of sprinkler of 1.30 m3/h, the performance testing results revealed that the square coefficient with the square spray field of 19 m×19 m was as high as 94.55%, with the uniformity coefficient of sprinkler irrigation 86.70%, while the actual unsprayed field on the square field accounted for 7.88% of the total square area.