The present invention relates to an ink cartridge for an inkjet printer, which comprises: an ink reservoir for storing ink, an ink outlet for supplying ink to the printer, and an installation detection component which is coordinated with the printer to detect whether the ink cartridge is successfully installed. The installation detection component includes a controller, a connecting circuit and a light-emitting portion connected with the controller through the connecting circuit. The controller is configured to control the light-emitting portion to emit light which will be received by sensors of the printer to determine whether the installation is successful, and controls the light-emitting portion automatically. The ink cartridge for the inkjet printer provided by the present invention solves the technical problem that the installation of the traditional ink cartridge must undergo strict actual inspection of a printer installation program.