The present invention discloses a processing device with freely selectable and replaceable food grills. The processing device comprises a base body (8), wherein the interior space of the base body (8) comprises a baking area (82) on a bottom part used for containing a plurality of grill assemblies (88) and grill devices (821), an operation area (81) arranged at the upper front side used for operating the selected grills and a grill sliding path area (83) arranged at the upper rear side. A sliding driving assembly (84) extended along a front to rear direction is arranged within the grill sliding path area (83) and used for enabling the selected grills to slide along the front to rear direction; wherein each of the plurality of the grill assemblies (88) comprises a grill mounting plate (7) with a notch facing downward, two lift driving screw rods (51) located at both sides of the grill mounting plate (7) and a lift body frame (6) driven by the lift driving screw rods (51).