A method of implementing packet search by double sliding windows is provided. The method adopts a three-level barrel shift register to store input packet data, and a position of a sliding window 1 is determined at 32 positions by primary testing of a link, so as to ensure that the packet data is located at the center of the sliding window 1, thereby ensuring that the position of the sliding window 1 meets a transmission characteristic of a specific link to the maximum extent. After the position of the sliding window 1 is determined, 32-bit packet data can be effectively searched in the sliding window 1 by dynamically adjusting a sliding window 2, and 32-bit transmission offset is allowed for the packet data. The method of implementing packet search by double sliding windows meets a transmission characteristic of a specific link to the maximum extent.