The utility model belongs to the technical field of feed processing, in particular to novel hydraulic pressure ensiling device, its primary structure is unloaded partial the constitution by the ensiling subtotal. The ensiling part comprises pneumatic cylinder, ensiling cover, ensiling jar and hydraulic circuit, the part of unloading comprises ensiling jar supporting seat, solenoid valve, pneumatic cylinder and hydraulic circuit. This device can pass through the pressure of the accurate regulation hydraulic pressure jar of hydraulic circuit, and then guarantees that the pressure of ensiling cover is lasting, has reduced intensity of labour. Adopt ensiling jar supporting seat and pneumatic cylinder to combine together, hydraulic circuit provides power, can empty the ensiling jar automatically, and the fodder of conveniently taking improves work efficiency. The quality of the fodder can be guaranteed with the log raft play in the ensiling jar to the solenoid valve. This device simple structure, convenient operation has reduced intensity of labour, has improved operational environment.