With the wide application of structural adhesives in the aerospace field, the structural adhesive films with only bonding property have not met the current needs. The structural-functional integrated adhesive films have become the current study hotspot. In this paper, an epoxy-based electromagnetic wave-absorbing adhesive film was prepared by adding the magnetite/SWCNTs as the absorbing agent to the epoxy adhesive. And then, it was subjected to hygrothermal aging for 1500h at 70°C and 90% RH. The results show that the absorbing filler was uniformly dispersed in the epoxy resin matrix. The reflection loss (RL) peak of the magnetite/SWCNTs/epoxy adhesive film reached −27.5 dB at the frequency of 8.75 GHz when the absorbing agent content was 20 wt%. The effective bandwidth was 3 GHz with 25 wt% absorbent content. Moreover, after 1000h of hygrothermal aging, the lap shear strength of the magnetite/SWCNTs/epoxy adhesive film decreased by 19.6%, indicating that it can perform excellent service under hygrothermal conditions.
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