Two-way hydraulic jack

The utility model discloses a two-way hydraulic jack, cylinder inside has runs through logical chamber, the cylinder both ends are equipped with first uide bushing and second uide bushing respectively, the first plinth, second plinth and the third plinth that are equipped with on the cylinder lateral wall and run through logical chamber intercommunication, be equipped with first piston rod and second piston rod in the cylinder, first piston rod and second piston rod stretch out from first uide bushing and second uide bushing middle part opening respectively, be equipped with first piston and second piston on first piston rod and the second piston rod outer wall respectively, first piston is located between first plinth of cylinder and the second plinth, the second piston is located between second plinth and the third plinth, all be equipped with the sealing member between piston and the cylinder and between uide bushing and the piston rod. The utility model provides a balanced holding device of hydraulic support back timber, overall structure is compact, and reasonable in design can realize that two-way hydraulic pressure supports, and stable in structure is reliable in relapseing the use, and mechanical precision is high