The invention discloses a method for interplanting of euphorbia lathyrus and cortex jatrophae and belongs to the technology field of crop planting. The method comprises the steps of seedling raising, interplanting land preparation, interplanting, managing and seed harvest. The interplanting land is a strip-shaped level land of 50 cm width and has a row spacing of 300 cm in the center. The pond for planting cortex jatrophae is of 40*40*40 cm size and has an intrarow spacing of 200 cm. Two ponds for planting Euphorbia lathyrus, with an intrarow spacing of 50 cm, are dig between rows of the cortex jatrophae. The field management of seedling supplementation, weeding and fertilizer supplementation are performed at the month 1, the month 6 and the year 2 after field planting. In the invention, two crops with high seed oil content are interplanted, so as to increase the economic benefit unit area. The yield of Euphorbia lathyrus seeds is about 287 kg per mu, and the economic return is 500-600 RMB. The method in the invention promotes the high-efficiency construction of production bases using cortex jatrophae raw material as biological energy source.