The invention discloses a device for melting snow and ice on roads. A connecting plate is fixed to a road sweeper body, the connecting plate is connected and fixed to a mounting plate by bolts, and the mounting plate is fixed to the top end of a shell. Air inlets are formed in the top wall of the shell and the side wall of the upper end of the shell, a fixed air out nozzle is installed on the bottom wall of the shell, a moving air outlet nozzle sleeves the fixed air outlet nozzle, and the moving air outlet nozzle is connected with the fixed air nozzle through a jackscrew. An electric heating pipe is arranged above the fixed air outlet nozzle, an air curtain machine is arranged above the electric heating pipe, the air curtain machine and the electric heating pipe are installed in the shell,and the air curtain machine and the electric heating pipe are powered by a generator installed on the road sweeper body. The device for melting the snow and ice on the roads has the beneficial effectthat outside air is ejected from the air outlet nozzles after passing through the air curtain machine and the electric heating pipe, the ejected hot air melts the snow and ice, and the melted snow water is timely inhaled into a sewage tank brought by the road sweeper body by the road sweeper body; and snow removal is clean and thorough.