The invention discloses glassfibre reinforced plastics and a preparation method thereof. The reinforced plastics comprises a structural layer and a surface layer, wherein the structural layer is made of a resin base material and glassfibres dispersed in the resin base material, and the surface layer is attached on the surface of the structural layer and is made of a surface lining material; the surface lining material is formed by uniformly coating resin paste on a facing material, and then precuring and drying; and the resin paste is formed by mixing the following components in parts by weight: 100 parts of vinyl resin, 1-2 parts of initiator, 2-4 parts of inner mold release agent, 30-130 parts of inorganic fillings, 20-90 parts of wear resistant powder, 15-50 parts of vinyl benzene, 0.5-2 parts of coupling agent and 1-20 parts of low shrink additive, wherein the wear resistant powder has the grain size of 10-74mum and the hardness of 8-10Mohs, and the facing material is a non-woven fabric of 60-100g/cm<2>. The reinforced plastics has favorable surface quality after being stored for a long term and is particularly suitable for application occasions with severer environments in the fields of bathrooms and the like.