Small size and reasonable structure, which is quite different from the traditional small square furnace. The traditional small square furnace is easily damaged due to the use of refractory bricks and asbestos panels. Therefore, it is often necessary to rebuild the furnace, which brings unnecessary economic losses and troubles to users. The current hydraulic small square furnace does not have the trouble of damage to consumables, it is durable, reasonable in design, low in power consumption, fast in speed and low in use cost, which brings significant economic benefits to users and is well received by the market.