Variable-section small furnace and glass melting furnace

The invention discloses a variable-section small furnace and a glass melting furnace, and relates to the technical field of float glass melting furnaces. The small furnace comprises a bearing refractory brick, a side wall, a small furnace arch and a bottom plate assembly; the two side walls are respectively piled on two sides of the bearing refractory bricks; two ends of the small furnace arch are respectively connected with the two side walls; the bottom plate assembly is arranged on the bearing refractory bricks, the bottom plate assembly, the side wall and the small furnace arch define a gas channel, and at least one end of the bottom plate assembly can move in the direction close to the small furnace arch so that the sectional area of the gas channel can be changed. The small furnace structure of the glass melting furnace is improved, the downward inclination angle of the bottom of the small furnace is changed by adjusting the position of the bottom plate of the small furnace, and the contact position of