In this study ,we developed a self-sealing miniaturized photoelectric detection module based on a low-temperature co-fired ceramic (LTCC) substrate. We confirmed that the module facilitates the rapid sealing of devices through the heating of the embedded resistance of the LTCC. It supports the internal integration of multi-functional optoelectronic chips and enabled planar and surface-mount mounting with external units; therefore ,the module exhibits enhanced installation adaptability and reliability. Test results showed that the module has high responsiveness and flatness in the 18GHz frequency range ,with its volume reduced by an order ofmagnitude compared to thatofa discretedevice. The costofthe moduleisexpected to decrease by more than half ,making itsuitable for a wide range of applications in broadband phased array systems on airborne ,spaceborne ,missile-borne ,and other platforms.