A fixture, a transport unit provided with the fixture, and a printing ink-spraying device. The fixture comprises: a carrier plate (1), at least one placement area (11) being provided on the carrier plate (1) for placing an object to be printed; and a cover plate (2), covering the carrier plate (1), the cover plate (2) being provided with a cover plate printing window (21) corresponding to an area to be printed on the front surface of the object to be printed, the carrier plate (1) and/or the cover plate (2) having a thickness of 1-2 mm. By configuring the thicknesses of the carrier plate (1) and the cover plate (2) to be 1-2 mm, the overall thickness of the fixture can be effectively reduced; an FPC board is mounted between the carrier plate (1) and the cover plate (2) for fixing, and then ink-spraying work is performed, so that the ink-spraying head can perform ink spraying for printing at a place close to the FPC board in an ink-spraying process, thereby effectively improving the FPC board printing effect.