Stirling-cooled infrared focal plane detector modules, characterized by their compact size, low power consumption, and high reliability, are widely used in various infrared systems. Among them, long-range missile weapon systems have high requirements on the startup time of guided operations, but existing infrared focal plane detectors are difficult to meet the corresponding needs. By analyzing the key factors influencing the startup time of infrared focal plane detectors, a novel design approach is proposed. While maintaining the original performance of the detector chip and the detector′s optical, mechanical, and electrical interfaces, a micro-dewar, cryocooler, and drive controller are employed to achieve rapid startup. Experimental results show that the new detector design achieves a cooling time of less than 210 seconds at room temperature. Compared with conventional designs, this design significantly shortens the startup time, meeting project requirements and providing a novel solution for the application of infrared focal plane detectors in missile weapon systems.