The invention discloses a preparation method for iron-plated graphene. The method comprises the steps: employing an improved Hummer method to prepare graphene, taking graphene, a reducing agent, molysite, a stabilizer, a complexing agent, a surface treating agent and a PH modifier as raw materials, and preparing an iron/graphene composite material through employing an in-situ reduction method. The iron-plated graphene provided by the invention is good in electromagnetic wave absorbing effect, and the iron/graphene composite material is stable in performance. Moreover, the iron-plated graphene is used for a novel intelligent anti-interference electric meter box. The iron/graphene composite material can integrate the high snooker frequency of iron particles, high saturation magnetization intensity, better impedance matching performances of graphene and electric dipole polarization relaxation, can bring a wider absorption frequency band and higher absorption intensity, and can achieve better absorption and shielding effects according to the frequency and intensity information of an interference unit.