The invention provides a method for snow melting and deicing of roads and bridges. The method includes the steps that S1, local meteorological historical data are collected; S2, energy q<0> required by snow melting and deicing is calculated according to the local meteorological historical data; S3, according to the energy q<0> required by snow melting and deicing, the total power W of carbon fiberheating wires is determined; S4, according to the total power W of the carbon fiber heating wires, the laying spacing L of the carbon fiber heating wires is calculated; S5, the carbon fiber heating wires are laid; and S6, a remote intelligent control system is installed. Compared with the prior art, the method for snow melting and deicing of the roads and the bridges has the beneficial effects that the energy required by snow melting and deicing is calculated according to the historical meteorological conditions in the area, the laying spacing of the carbon fiber heating wires is determined according to the energy required by snow melting and deicing, the waste of the energy can be greatly reduced, and the cost is saved.