The invention discloses a glass fiber reinforced plastic shell assembly for an eddy current brake electromagnet. The assembly is characterized in that an iron core is placed in a glass fiber reinforced plastic shell, a coil is wound on the iron core, the glass fiber reinforced plastic shell makes contact with a bottom face of the coil, a supporting plate is installed at the bottom of the glass fiber reinforced plastic shell, and the fixing plate is installed at the bottom of the supporting plate. The assembly is advantaged in that the glass fiber reinforced plastic shell and the aluminum supporting plate in the shell assembly are small in density, and the weight can be greatly reduced, breakdown by spatter is difficult, plastic deformation is not prone to occurring after impact, and firmness and durability are achieved. When being impacted, the impact force can be partially digested by collapsing and absorbing energy during impact, when splashes hit the outer shell, the outer shell makes direct contact with an electrified coil, no short circuit occurs, and reliability of the eddy current brake electromagnet is improved.