The fourth generation environmentally friendly intelligent solvent recovery machine has the functions of intelligence, automation, safety, efficiency, unmanned operation, uninterrupted work, and non-contact liquid level control. This device adopts the latest structure, with a slotted flange on the top cover and a solid high-temperature resistant circular casting for the sealing ring. The sealing effect is good and can be reused repeatedly without easy damage. The top cover adopts an arched structure, which increases pressure resistance and can increase solvent storage capacity. Heating tube with sheath device, equipped with automatic input of waste solvent, automatic constant temperature, automatic timing, automatic shutdown, automatic refrigeration, cold water circulation, and a device that can observe the storage quantity of heat transfer oil and waste solvent. The use of explosion-proof solid-state relays, without the need for dry vacuum pumps and refrigeration units, may pose a risk of fire due to long-term disrepair. However, although refrigeration units are not used for cooling, the cooling effect is far better than that of refrigeration units. During work, it can be unmanned, from work to work, and during the recycling process, waste solvents can be automatically replenished without interruption.