The invention discloses a silane cross-linked semi-conductive shielding material as well as a preparation method and application thereof. The semi-conductive shielding material is prepared by mixing amaterial A and a material B in water according to a mass ratio of (2-5) to 1, and then crosslinking; the material A is prepared from the following raw materials in parts by weight: an ethylene-butylacrylate copolymer, bimodal polyethylene, conductive carbon black, an antioxidant, silane, an initiator, a lubricating agent and a dispersing agent; the material B is prepared from the following raw materials: bimodal polyethylene and a hydrolysis catalyst; the content of butyl acrylate in the ethylene-butyl acrylate copolymer is 10-30%, and the melt index of the bimodal polyethylene is 0.1-20g/10min; the preparation method comprises the steps of respectively preparing the material A and the material B, and then crosslinking the prepared material A and material B according to the mass ratio; the silane cross-linked semi-conductive shielding material is applied to overhead insulating material for wires and cables. The semi-conductive shielding material provided by the invention has higher temperature-resistance grade, better mechanical strength, lower volume resistivity, and other properties, and has the advantages of being mild in preparation conditions, rapid in reaction speed, and the like.