The device used to assist forklifts and other handling vehicles in passing through the loading and unloading platform and directly entering the interior of the trucks for batch loading and unloading of goods. Flap type hydraulic dock leveller suitable for most of the logistics warehouse using, its characteristic is in front of the lip plate can fold up and down. This design makes the application scenarios of the flap unloading platform relatively extensive, and there are no particularly strict requirements for the application scenarios.