The invention discloses a hot-melting masking tape. The hot-melting masking tape comprises masking paper and an adhesive coating the masking paper. The adhesive comprises the following components: 40to 80 parts of rubber, 8 to 20 parts of a heat-conducting filling material, 8 to 20 parts of a flame-retardant filling material, 10 to 30 parts of tackifying resin and 2 to 8 parts of a coupling agent. According to the invention, the specific adhesive is reasonably blended and a specific production process is employed; the process is simple in steps and low in production cost; and the prepared tape has excellent heat conduction effect, good viscosity, good flame retardation effect and no pollution, and is effectively applicable to the field of the electronic industry.