[Objectives]  As a vector field, the geomagnetic field (GMF) can not only provide orientation (location) information for the creatures on Earth but also potentially affect their evolution. Studies showed that magnetic field intensity changes could result in bio-effects on organisms’ physiology, metabolism, behavior, etc. It would help clarify these magnetic effects with insects as model organisms by exploring how the changes in GMF intensity affect their physiological development. [Methods]  In order to explore the magnetic response strategies of migratory insects to changes in the GMF intensity, we chose small brown planthopper, Laodelphax striatellus, which is a migratory pest on rice, as the study object and simulated the GMF intensity absence by creating the near-zero magnetic field with Helmholtz coils system, to clarify the bio-effects triggered by the extreme treatment of GMF intensity absence (NZMF versus GMF) on the growth, development and reproduction of L. striatellus. [Results]  Compared to the GMF control, NZMF significantly prolonged the nymphal duration (+8.23%) as well as longevity of male adults (+35.60%), while significantly shortened the longevity (–17.68%) of female adults and decreased the body weight of female (–15.82%) and male (–15.21%) adults. No significant effect on the egg duration of L. striatelluswas found in this study. [Conclusion]  The NZMF (versus GMF) significantly affected the growth and development of L. striatellus, and induced a sexually dimorphic bio-effect on longevity of adult L. striatellus.