A diffuser including a gas supply, gas tank and micro-hole thin-film is provided. The gas tank may be coupled to the gas supply via a gas tube. The micro-hole thin-film has a plurality of micro holes and disposed at the gas outlet of the gas tank. The gas supply can transmit pressurized gas to the gas tank via the gas tube, and the pressurized gas will jet from the micro-hole thin-film to generate a great number of micro bubbles in the water.
