This study investigates the application of flower-shaped bionic topology in phased array antenna liquid cooling systems through computational fluid dynamics (CFD) simulations and experimental validation. The phased array antenna comprises a rectangular transmitting module, 4 L-shaped receiving modules and 12 rectangular receiving modules. All these three types of liquid cooling plates are designed to form either a flower-shaped bionic topology or a fully parallel topology. Comparative analysis reveals that the flower-shaped bionic topology offers a highly efficient thermal control solution. The temperature gradient of the antenna employing flower-shaped bionic topology is significantly smaller than that of the fully parallel topology. The temperature difference between modules is controlled to ±3 ℃, representing an 8%~15% improvement over the fully parallel topology.