A garlic breaking device is composed of a plastic container and a plastic handle, and is characterized in that the flat-balloon-shaped container is made of polyvinyl plastic, and an inner thread is arranged at an opening of the container; the hollow handle with the length ranging from 20 cm to 40 cm is made of hard plastic, an outer thread matched with the inner thread at the opening of the container is arranged at one end of the handle, and an exhaust one-way valve is arranged inside the part with the outer thread. According to the technical scheme, when the garlic breaking device is used, thoroughly-peeled garlic is put into the flat-balloon-shaped container, the handle is fastened, the container is pressed flat, air inside the container is exhausted through the exhaust one-way valve at one end of the handle, the one-way valve is switched off automatically, a person holds the handle with the right hand and forcefully throws the container to a chopping board a few times, garlic cloves inside the container can be broken into mashed garlic in about 3-5 s, the handle is unfastened, the mashed garlic is poured out, and a cold dish with dressing can be blended; thus, by using the garlic breaking device for processing the smashed garlic, splashing can be avoided, the processing speed and efficiency are high, and the garlic breaking device is more suitable for processing a large amount of garlic in canteens or restaurants.