Abstract: An ink cartridge for an inkjet printer includes a top cover, a bottom wall, a handle, an ink chamber, an air inlet, an ink supply port. The air inlet is disposed at the top of the ink chamber, such that the ink chamber is communicated with the atmosphere. A labyrinth capillary is disposed at the side surface of the bottom wall, with one end in communication with the bottom portion of the ink chamber and the other end in communication with the cavity for accommodating elongated fiber bundles. The ink supply port is disposed at the bottom of the cavity for accommodating elongated fiber bundles, and the elongated fiber bundles are accommodated in the cavity. The present invention has the following advantages of greatly reducing the residual ink, improving the printing yield, and reducing the manufacturing cost; reducing the waste, thereby benefiting for environment protection; and accomplishing the mass production, thereby enhancing the qualification rate.