Abstract: An apparatus for causing milk-like bubbles to be contained in fluid comprises an inlet and outlet of a high-pressure pump respectively combined with an input pipe and a connecting pipe; the input pipe is combined with an air entering pipe; the connecting pipe is combined with a high-pressure groove; the high-pressure groove is further combined with an output pipe; an input hole of the input pipe is larger than an output hole of the output pipe to allow the flow of fluid entering high-pressure pump to be larger than the flow of fluid expelled out of the output pipe, air is drawn into a fin set of the high-pressure pump through the air entering pipe to mix with the fluid and is quickly stirred to form tiny bubbles, and then delivered to the high-pressure groove to store there, the bubbles are finer owing to a higher hydraulic pressure; the fluid with the tiny bubbles is expelled from the output pipe.