The invention provides a chemical melting tower intelligent temperature control system which comprises a melting tower and a PLC control cabinet, wherein an acid circulating pump is arranged on a feedpipe connected to the melting tower; a heat transfer oil circulating pump is arranged in a heat transfer oil circulating pipeline connected to the melting tower; a heating vaporization device and a cooling device are arranged in parallel; a sweating pneumatic valve and a sweating proportioning valve are arranged in a heat supply pipeline of the heating vaporization device; a crystallization pneumatic valve is arranged in a cold water outlet pipe of a cooling crystallization device; the heating vaporization device is communicated with an industrial vapor outlet pipe; a cooling water circulating pump is connected to a cold water supply pipeline of a cooling device; the acid circulating pump, the heat transfer oil circulating pump, the sweating pneumatic valve, the sweating proportioning valve, the crystallization pneumatic valve and the crystallization proportioning valve are all connected with the PLC control cabinet. According to the system, the PLC control cabinet controls the wholefusion process to realize automatic intelligent control of the whole fusion process, the purification concentration of benzoic acid is increased, and the labor input is reduced.