Abstract: An easy setting hour repeating device comprising mainly of a transmission shaft, a slot (or flange), a minute wheel, a cam claw, a short spring and a long spring, wherein the slot is provided at the side edge of the hand assembly section on the top of the transmission shaft which is protrusively extended on the dial from the minute wheel, and the position of the slot forms a certain included angle with the cam claw under the wheel, when the minute wheel moves, the cam claw will contact the alarm spring first, then release the spring to make the spring activate the electric circuit of the alarm clock, the slot are aligned with the dial index 12, during assembly, it requires only the slot, minute hand and the dial index 12 be aligned to make the alarm clock repeat on the hour to achieve the easy hands assembly purpose.