The invention relates to a low dioxin emission system and method for high-temperature carbonization pyrolysis and high-temperature gasification incineration of medical waste. The system comprises a dry distillation bar making system and a high-temperature gasification purifying system. The dry distillation bar making system comprises a storage warehouse, a carbonization furnace, a bar making machine, a warehouse, a purifying device, a waste heat boiler and a combustion chamber. Solid waste is brought out of the storage warehouse and then thrown into the carbonization furnace, and after carbonization, solids and oil tar are removed out and conveyed to the bar making machine to serve as raw materials. The carbonization furnace is connected with the combustion chamber and the purifying device. The purifying device is connected with the waste heat boiler. The high-temperature gasification purifying system comprises a draught fan, a gasification furnace, a waste heat boiler, a quenching tower, a dioxin removing tower, a cyclone mixing adsorption device, dust collecting bags, an induced draught fan and the like, wherein the draught fan, the gasification furnace, the waste heat boiler, the quenching tower, the dioxin removing tower, the cyclone mixing adsorption device, the dust collecting bags, the induced draught fan and a chimney are sequentially connected. By means of the system and method, emission of dangerous waste and medical waste can be effectively controlled, and harmlessness, reduction and reclamation are achieved.