A bubble-jet type ink-jet printhead is provided. The bubble-jet type ink-jet printhead includes a substrate 100, a nozzle plate 101, a wall 102, and a heater 103. The heater 103 is interposed between the substrate 100 and the nozzle plate 101 to divide an ink chamber filled with ink into a main ink chamber 106 and a secondary ink chamber 107, thereby generating a main bubble and a secondary bubble. The printhead further includes an ink channel 110 for introducing ink into the secondary ink chamber 107 and then supplying the ink to the main ink chamber 106. Accordingly, the printhead consumes less energy, prevents a backflow of ink, and operates at increased speed.