A method for controlling light emission of an ink cartridge, wherein the ink cartridge is detachably mounted on a main body of an imaging device, and the ink cartridge comprises an interface unit used for receiving a signal transmitted by the main body of the imaging device, a storage unit used for storing relevant information of the ink cartridge, a light emitting unit for emitting light to a light receiving unit disposed on the main body of the imaging device, and a control unit for controlling the light emitting unit to emit light, and at least two ink cartridges arranged on the main body of the imaging device, characterized in that the method comprises: receiving and identifying, by the control unit, a light emitting control instruction from the main body of the imaging device; starting, by the control unit, a light-on delay timing when identifying that the light emitting control instruction is a light-on instruction; controlling, by the control unit, the light emitting unit of the ink cartridge to stop emitting light when identifying that the light emitting control instruction is a light-off instruction; controlling, by the control unit, the light emitting unit to emit light when detecting that a timing value of the light-on delay timing reaches a delay threshold value; wherein, the delay threshold value is greater than the adjacent detection time period, which is a time interval for an adjacent position detection of the ink cartridge to be detected by the main body of the imaging device, and is less than the facing detection time period, which is a time interval for a facing position detection of the ink cartridge to be detected by the main body of the imaging device; wherein, the facing position detection is a process of the imaging device actuating the light emitting unit of the ink cartridge to be detected facing to a light receiver to emit light, and detecting whether light amount received by the light receiver is greater than a preset value, and the adjacent position detection is a process of when the ink cartridge to be detected is at a position facing to the light receiver, the imaging device actuating a light emitting unit of any ink cartridge adjacent to the ink cartridge to be detected to emit light, and detecting whether light amount received by the light receiver at this time is less than the light amount received during the facing position detection. receiving and identifying, by the control unit, a light emitting control instruction from the main body of the imaging device; starting, by the control unit, a light-on delay timing when identifying that the light emitting control instruction is a light-on instruction; controlling, by the control unit, the light emitting unit of the ink cartridge to stop emitting light when identifying that the light emitting control instruction is a light-off instruction; controlling, by the control unit, the light emitting unit to emit light when detecting that a timing value of the light-on delay timing reaches a delay threshold value; wherein, the delay threshold value is greater than the adjacent detection time period, which is a time interval for an adjacent position detection of the ink cartridge to be detected by the main body of the imaging device, and is less than the facing detection time period, which is a time interval for a facing position detection of the ink cartridge to be detected by the main body of the imaging device; wherein, the facing position detection is a process of the imaging device actuating the light emitting unit of the ink cartridge to be detected facing to a light receiver to emit light, and detecting whether light amount received by the light receiver is greater than a preset value, and the adjacent position detection is a process of when the ink cartridge to be detected is at a position facing to the light receiver, the imaging device actuating a light emitting unit of any ink cartridge adjacent to the ink cartridge to be detected to emit light, and detecting whether light amount received by the light receiver at this time is less than the light amount received during the facing position detection.