To provide an ice making method of a flowing-down type ice making machine for enhancing utilization efficiency of ice making water, and operating a link mechanism without using an electric motive power source such as a motor.

This ice making method of the flowing-down type ice making machine actively makes an ice making space S by cooperation of an ice making small chamber 6 and a cover part 11, and can enhance the utilization efficiency of the flowing-down ice making water. A water source for making ice can be effectively used by using weight of the ice making water used for making ice for a driving source of the link mechanism 14. Thus, a first water tank 13 or a second water tank 16 can be properly moved by a waterway system without using the motor. Thus, the cup-shaped ice making small chamber 6 can be properly blocked up by the cover part 11 arranged in a front part of the first water tank 13. The first water tank 13 completely rises, and the ice making water can be made to flow down from a water sprinkling pipe 8 in a state of completely making the ice making space S.