The invention provides a demolding machine for a concrete hollow hexagonal brick. The demolding machine for the concrete hollow hexagonal brick comprises a base plate, an electric cylinder device, a supporting device, a jacking and backing device, a lifting device, a knocking device, a support device, a pushing device and a pressing device, wherein the electric cylinder device is located on the base plate, the jacking and backing device is arranged below the supporting device, the lifting device is arranged on the base plate, the knocking device is located on the lifting device, the support device is arranged above the supporting device, the pushing device is arranged on the support device, and the pressing device is arranged on the pushing device. According to the demolding machine for the concrete hollow hexagonal brick, automatic and mechanized demolding of the hollow hexagonal brick can be achieved; the demolding efficiency is high; besides, the hollow hexagonal brick is driven tofully vibrate through adoption of repeated knocking; the hollow hexagonal brick is driven to demold from a mold; because of a periodic knocking manner and repeated knocking is achieved in one period,the demolding efficiency is improved; generation of damage to the hollow hexagonal brick is reduced; and product defective rate is lowered.