Microelectromechanical system thermopile infrared detectors are an important infrared detection technology that is widely used in diverse fields. Owing to the continuous development of infrared technology and the increasing demand for its applications, the performance index for thermopile infrared detectors has increased. A thermopile structure with an integrated super-surface structure in the absorption region is designed to increase the absorption rate of infrared light from 9 to 11 μm to about 70%. Additionally, the thermocouple strip is designed as a quadrilateral structure with a narrow hot end and a wide cold end, which allows the hot end to extend to the temperature-concentration region, thus reducing the internal resistance. Finite-element simulation software is used to simulate the structure, and the results show that the response voltage of the detector after integrating the super-surface can reach 37.876 mV. Meanwhile, the response and detection rates are calculated to be 41.9 V/W and 1.97×10⁸ cm·Hz^1/2·W⁻¹, respectively, with performance enhancement by 38.9%, 38.7%, and 39.7% recorded.