The invention discloses a cavity of a cooking device and the cooking device. The cavity of the cooking device comprises a cavity portion and a cavity front plate. The cavity portion comprises a first connecting end; and the cavity front plate comprises a second connecting end. Either the first connecting end or the second connecting end is formed into a stepped structure; and through a height difference of the stepped structure, a pit is formed. The other one of the first connecting end and the second connecting end is connected into the pit and is in sealing connection to the stepped structure, so that a compartment of the cavity is defined; and the connecting end in the pit is located within the compartment. According to the cavity of the cooking device of the embodiment provided by the invention, since the connecting end is located within the pit, a part where the cavity front plate and the cavity portion are connected is free from a step or is relatively low in step and the cavity front plate and the cavity portion are connected relatively close. With the application of the connecting structure, functions of reducing microwave ignition and enhancing microwave sealing and steam sealing effects can be achieved relatively easily, and subsequently, the safety of the cooking device can be enhanced.