It can be applied to control outrigger of construction machinery, vehicles and other equipment, and mainly used for controlling the outrigger of truck mounted cranes at currently. The first working section which next to port P adopts spring return, while the other four sections steel balls are positioned; The valve adopts monoblock design with a compact structure to reduce the risk of oil leakage; Setting an relief valve at the connection port of the horizontal outrigger oil cylinder can effectively prevent the horizontal oil cylinder from bending when it touches an object when extending; This valve can be operated from both ends. Suitable for five outriggers.