Micro-nano bubble preparation device and preparation method thereof

The invention discloses a micro-nano bubble preparation device which comprises a water supply device, a gas supply device, a gas-liquid mixing device and a secondary gas dissolving device, the gas supply device supplies air to the gas-liquid mixing device, the water supply device supplies liquid to the gas-liquid mixing device, the gas-liquid mixing device divides the air into a large number of tiny bubbles, and the tiny bubbles and water form a mixture, and a gas-liquid mixture is formed; the secondary air dissolving device comprises an air dissolving body, a hydraulic turbine device, a cutting part and a release part, the air dissolving body is provided with a first cavity and a second cavity, the hydraulic turbine device is installed in the first cavity, the cutting part is located in the second cavity and is coaxial with the hydraulic turbine device, and the release part is communicated with the second cavity. According to the micro-nano bubble preparation device, a large number ofmicro-nano bubbles can b