The invention belongs to the field of wave absorbing, environmental protection and coating application, and particularly relates to a coating capable of efficiently absorbing power frequency electromagnetic fields, in particular to a coating capable of efficiently attenuating electromagnetic fields generated by power frequency electromagnetic waves. The coating is composed of the following components of a coating body and powder, wherein the ratio of the mass percent of the coating body to the mass percent of the powder is (7-3):(3-7). The coating has the advantages that a dielectric materialand a magnetic material are subjected to integrated treatment, a MWCNT/FeNi multiwalled carbon nanotube/iron-nickel alloy composite nanowire powder material is prepared, a wave absorbing agent is dispersed in the coating, and therefore effective protection against electromagnetic radiation can be achieved, and the problem of radiation of the power frequency electromagnetic waves of a transformer substation can be solved; the purpose that the coating can simultaneously attenuate radiation electric fields and magnetic fields generated by the power frequency electromagnetic waves can be achieved,and the blank of application of a wave absorbing material at the power frequency electromagnetic wave band of 50Hz and 60Hz can be filled up; and a spraying technology is simple and convenient, and the effect of protection against electromagnetic pollution can be achieved after the coating is sprayed and used.