A double-slug composite profile control agent for low-permeability pore-type reservoirs and its application method relate to the field of oilfield applied chemistry. The present invention injects into low-permeability pore-type oil reservoirs in the form of double slugs, and the pre-slugs are mixed with sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid, and aluminum citrate, and have low viscosity, With the characteristics of strong fluidity and strong shear resistance, it can block the high-permeability pores inside the reservoir; the rear slug is a compound surfactant, and the unplugged pores are flooded with surfactant to reduce Remaining oil content in the reservoir, increase the water absorption index of the reservoir, and improve the deposition of wax, colloid, and asphaltene in the near-wellbore zone; improve the heterogeneity of the reservoir through the combination of double slugs, and increase the follow-up water flooding sweep coefficient , to suppress the formation of dead oil zones in low-permeability pore-type reservoirs, so as to improve the disadvantages of traditional oil recovery methods such as low recovery and poor economic benefits for low-permeability pore-type reservoirs.