Adjustable 3D printing equipment Z-axis limiting device and 3D printing equipment

The utility model discloses an adjustable 3D printing equipment Z-axis limiting device and 3D printing equipment, and relates to the technical field of 3D printing. The Z-axis limiting device comprises a mounting base, a rotatable part is arranged on one side of the mounting base and fixedly connected with a main shaft, the main shaft is installed in a shaft hole in the mounting base in a clearance mode and penetrates through the mounting base, and a gear is fixedly connected to the end, penetrating through the mounting base, of the main shaft. A slotted hole is longitudinally formed in the position, close to and right opposite to the tooth surface of the gear, of the installation base, a rack which is meshed with the gear and can move up and down under rotation driving of the rotatable component is installed in the slotted hole in a clearance mode, the upper end of the rack upwards stretches out of the installation base, and a locking device used for locking and fixing the rack is arranged on the installatio