Light composite material capable of efficiently shielding low-frequency magnetic field

The invention discloses a lightweight composite material capable of efficiently shielding a low-frequency magnetic field. The lightweight composite material comprises a carbon fiber reinforced resin layer, a permalloy sheet and a copper net, the layer number of the permalloy sheet is not less than 1, and the layer number of the copper mesh is not less than 2; the carbon fiber reinforced resin layer, the permalloy sheet and the copper net are arranged in parallel; at least one layer of permalloy sheet is positioned between the two layers of copper nets, and carbon fiber reinforced resin layers are respectively arranged between the permalloy sheet positioned between the two layers of copper nets and the two layers of copper nets. The composite material disclosed by the invention solves the shielding problem of a low-frequency magnetic field less than or equal to 10MHz, has a good magnetic shielding effect in a full frequency band, has the advantages of light weight and corrosion resistance, and has a wide appli