The microwave absorption properties of porous microwave absorption functional aggregate and mortar prepared by template sintering were studied by using shale, organic matter(rice) and Mn Zn ferrite. The results show that in this system, the porous microwave absorption functional aggregate with controllable pore structure and compressive strength of 65MPa can be prepared after sintering at 1000℃ for 30min. When the pore diameter is 245833μm and the content of organic matter is 25%, the temperature rise of functional aggregate and functional mortar irradiated by microwave for 30s is the highest, which can rise from room temperature to 2188℃ and 1194℃ respectively, and the melting time of functional mortar is 485s. The porous structure can improve the impedance match between functional aggregate and free space, absorb more microwave, significantly enhance the microwave absorption capacity of functional aggregate and functional mortar, and increase the temperature rise of microwave irradiation.