Mobile phone case with white printing area and printing device for same

A printing device for a mobile phone case with a white printing area, comprising a workbench, wherein a bottom of an inner wall of the workbench is fixedly connected to a placement table, the placement table is configured for providing a placement area for the mobile phone case, a shielding assembly is arranged inside the workbench, the shielding assembly is configured for shielding sprayed paint, and a top of the workbench is fixedly connected to a raw material box, wherein the raw material box is internally fixedly connected to a conveying tube, a triple-nozzle tube is arranged at a bottom of the conveying tube, an outer wall of the triple-nozzle tube is provided with a replacement assembly, and the replacement assembly is configured for portable replacement of the triple-nozzle tube;

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• the shielding assembly comprises protective covers, the protective covers are arranged on both sides of inside of the workbench, a bottom of the workbench is fixedly connected to a motor, an output end of the motor is fixedly connected to a gear, a bottom of either of the protective covers is fixedly connected to a sliding block, the sliding block is internally slidably connected to a limit plate, the limit plate is fixedly connected inside the workbench, one side of the sliding block is fixedly connected to a rack, and the rack is meshed with the gear.