The invention discloses a manufacturing method of a 7000-series aluminum alloy section for vehicular bodies. The 7000-series aluminum alloy section comprises alloy elements including, by mass, 0.145%-0.155% of Si, 0.145%-0.155% of Fe, 0.09%-0.11% of Cu, 0.045%-0.055% of Mn, 0.58%-0.8% of Mg, 0.019%-0.021% of Cr, 5.5%-5.8% of Zn, 0.15%-0.19% of Zr, 0.028%-0.031% of Ti and the balance aluminum, wherein other single element content is smaller than or equal to 0.045%, other element total content is smaller than or equal to 0.15%, and a Zn / Mg ratio is controlled to be 7-10. The manufacturing method includes procedures of smelting, purification, casting for rod forming, homogeneous annealing, extruding, stretching, natural aging, manual aging treatment and the like, great static collision effects of materials can be achieved, the 7000-series aluminum alloy section is especially suitable for manufacturing of aluminum alloy energy absorption boxes and longitudinal beams for vehicular bumper systems, and comprehensive requirements of light weight of the vehicular bodies and energy absorption in low-speed and high-speed collision can be met.