Infrared absorbers based on metamaterials are widely used in military and daily life, due to their superior characteristics of wide spectral range, fast response, and high sensitivity, etc. In this study, a metamaterial absorber with a stacked structure is investigated, which utilizes the local field enhancement effect of optical metamaterials and combines the temperature-sensitive properties of pyroelectric materials to achieve mid-infrared detection. Based on this, a metamaterial absorber (covering the atmospheric window (8~14 μm)) that can modulate the peak wavelength in the range of 3~15 μm was designed, with an absorbance rate of 99.9% and a bandwidth range of 0.2~1 μm. The distribution of the detector heat can be adjusted by the absorber, and the temperature is elevated by a factor of about 21 compared to similar work at the same size. A multi-physics analysis method is used to analyze the electromagnetic field characteristics and thermal properties of the absorber and pyroelectric material (LiTaO3) coupled structure. The results show that when the array of detectors is 5×5, the temperature rise of the detector steady-state temperature is 0.311 K. The designed metamaterial absorber can significantly improve the thermal response and stabilization temperature of the device, and it is applicable to thermal imaging and sensing in uncooled Mid-Infrared and Far-Infrared wavelengths at the large-scale image element level.