Abstract: In order to improve the fracturing stimulation efficiency of tight oil and gas reservoirs, it is urgent to study the fracture-induced stress field distribution in a double horizontal well. Based on the 3D displacement discontinuity method, the fracture closure after pump shutdown and pressure relief, and interference of the previous fracture on the subsequent fracture, a stress interference mechanical model of intensive cut fracturing of double horizontal wells was established to study the stress interference behavior of double horizontal wells under different hydraulic fracturing modes. The relationship among the well spacing, fracture spacing, and stress interference intensity was analyzed. The results show that the fracture opening of the subsequent fracture is promoted by the previous fracture in the improved zipper-type fracturing, and a continuous zone of induced tensile stress is formed between the wells. The improved zipper-type fracturing better meets the requirements for generating complex fractures in well factory fracturing processes. It is recommended that the fracture spacing of the improved zipper-type fracturing of double horizontal wells is 0.5–1.0 times of half fracture length, and the well spacing is 1.6–2.6 times of half fracture length. The law of stress interference in the fracturing of double horizontal wells provides a theoretical basis for the optimization of well factory fracturing technology.