The invention discloses an asphalt melting device for highway engineering, and belongs to the field of highway engineering. The asphalt melting device for highway engineering includes a crushing mechanism, a melting mechanism, a filtering mechanism and an insulation mechanism, a fixing clamping piece is fixedly connected to the side end of the crushing mechanism, and the crushing mechanism is connected to the upper end of the melting mechanism through the fixing clamping piece in a clamped mode; and the outer end of the melting mechanism is fixedly connected with an auxiliary motor unit, the auxiliary motor unit includes two pairs of auxiliary motors, a through hole matched with the auxiliary motor unit is formed in the side end of the melting mechanism, the power output ends of the auxiliary motors penetrate through the through hole and are fixedly connected with rotary heating spike assemblies, the two pairs of rotary heating spike assemblies are arranged in the melting area, and opposite rotation of the two adjacent pairs of rotary heating spike assemblies is used for making asphalt blocks mix evenly. On the one hand, the multiple crushing effect is further achieved, on the other hand, the melting time of the asphalt blocks in melting mechanism can be prolonged, and compared with original melting devices, the melting rate can be increased.