Furnace for vertical cracking still

A furnace for a vertical cracking still is made of a high-temperature refractory material and comprises a pyrolyzation chamber and a combustion chamber. The pyrolyzation chamber is arranged on the upper portion of the furnace, the combustion chamber is arranged on the lower portion of the furnace, a fire grate is arranged between the pyrolyzation chamber and the combustion chamber, and a rotating device is connected with a column of the fire grate, so that the fire grate is capable of rotating at a set speed in a set direction. Since the combustion chamber is trapezoidal or pot-shaped, heat of the combustion chamber is reflected by the inner wall of the combustion chamber and is more concentrated, and accordingly the temperature of the combustion chamber is increased, the working temperature of a combustion region is also increased, and work efficiency of the cracking still is improved.