In response to the widespread issue of pollution in dead-end pipes within urban water supply networks, an innovative solution involving the installation of spoilers was proposed. This study systematically investigated the impact of spoilers on the dispersion of pollutants within dead-end pipes under low Reynolds number turbulent flow conditions and evaluates their control effectiveness using particle image velocimetry technology. Additionally, the design parameters of the spoilers were optimized. The experimental results indicated that spoilers can create a cavity structure at the junction between the dead-end pipe and the main pipe, significantly altering the flow path and pattern of the incoming flow, reducing the rotational intensity within dead-ends, and weakening the mixing effect. The design parameters of spoilers, including tilt angle, height, and width, as well as their installation position, have a significant impact on the control effectiveness. Specifically, spoilers with a tilt angle of 30°, larger height and width, and installed at the leading edge of the main pipe are more effective in suppressing the spread of pollutants into the main pipe. This study provides new ideas and methods for water quality assurance and operational management of water supply networks, which is of great significance for ensuring the safety of residential water usage.