The invention provides a magnetic hot melt type sulphide mastic as well as the preparation method and the application thereof. The magnetic hot melt type sulphide mastic comprises the following raw materials in weight ratio: 60-70 parts of sulfur, 35-40 parts of corrosion-resistant filler, 5-10 parts of magnetic powder, 5-10 parts of a toughening agent, 3-5 parts of a hyperdispersant and 2-4 partsof mineral admixture, which are mixed together, and the density of the mixture is 2343-2628 kg/m3. The materials are mixed according to the mix proportion of the components, therefore the magnetic hot melt type sulphide mastic provided by the invention not only is resistant to tensile strength, frost and corrosion and quick in solidification, but also has the characteristic of self-melting underthe action of the external alternating magnetic field when the internal temperature is raised. The component made of the magnetic hot melt type sulphide mastic provided by the invention is adopted andapplied to the external anchor head of an anchor wire. When in demolition, the hot melt type sulphide mastic in the anchorage of the external anchor head is melted automatically under the action of the external alternating magnetic field, the anchorage is then separated from the steel strand, and the anchor wire loses the tension, thereby reducing the difficulty in demolition and decreasing the construction cost.