Quicklime grinding system

The utility model provides a quicklime grinding system. Comprising a vertical mill, a bag collector, a fan, a first air locking valve and a second air locking valve. The vertical mill is provided with a feeding port and a discharging port. And the bag collector is connected with the discharge hole and is provided with a finished product outlet. And an air inlet of the fan is connected with the bag collector. And an air outlet of the fan is connected with the vertical mill. And the first air locking valve is arranged at the feeding port. The second air locking valve is arranged at the finished product outlet. The first air locking valve is arranged, so that external water vapor cannot enter the vertical mill along with the quick lime, and the quick lime is prevented from reacting with the water vapor. Moreover, due to the arrangement of the second air locking valve, external water vapor is prevented from entering and reacting with the output finished product quicklime powder, and quicklime is also prevented fr