The invention relates to a microwave heating type cracking furnace for saving fuel resources in a production process. The invention adopts the technical scheme that the microwave heating type cracking furnace comprises a closed heating furnace body and a matched heating, pressure-maintaining and pyrolysis atmosphere maintaining mechanism and adopts a structure integrating pyrolysis, carbonization and activation. The structure comprises the furnace body and a sliding sealed cover plate which is arranged at the furnace top; the pyrolysis furnace body comprises a pyrolysis furnace chamber which uses a microwave heat source and an activation chamber arranged below the pyrolysis furnace chamber; wherein the pyrolysis furnace chamber is in a positive-pressure, nitrogen-atmosphere and movably sealing-type structure; the sliding sealed cover plate at the top of the pyrolysis furnace chamber is provided with a reverse V-shaped groove rail made of sealing material and a sealing-type friction pair; the reverse V-shaped groove rail is made of embedded sealing material; and the sealing-type friction pair slides with the matched reverse V-shaped groove rail arranged at the upper end of the pyrolysis furnace body. The structure comprises a shell-type stand, and a space in the furnace body is separated into the pyrolysis furnace chamber and the activation chamber by the match of a sealing separator II and the elastic sealing material arranged on a shell in match with a movable sealing matching part. The invention integrally realizes four-in-one operation and has simple structure and strong reliability.