The dielectric barrier discharge (DBD) plasma actuator is commonly used in flow control and other applications because of its simple design and rapid responsiveness. However, it still suffers from weak effectiveness and limited discharge extension. A sector-shaped dielectric barrier discharge (SS-DBD) plasma actuator has been developed to address the above deficiencies, featuring an adjustable jet angle to enhance flow control effectiveness. The dynamic evolution of the flow field induced by the SS-DBD plasma actuator is quantitatively analyzed using a Particle Image Velocimetry (PIV). Experimental investigations reveal that the maximum velocity of the induced jet can be modulated through precise adjustment of the actuation voltage. Furthermore, a quasi-linear correlation has been established between the SS-DBD-PA’s sector-shaped angles and the jet angles, indicating that changes in the sector-shaped angles directly influence the direction of the induced jets. This correlation enables precise control of jet angles, significantly enhancing flow control by adjusting the SS-DBD-PA’s sector-shaped angle.