The invention belongs to the technical field of pressure exchange, and discloses a
fluid pressure energy recovery device and a fluid switcher thereof, and the fluid switcher comprises a first low-pressure
barrel, a first connecting
barrel, a high-pressure
barrel, a second connecting barrel and a second low-pressure barrel; a
piston assembly is arranged in a through cavity formed by the components and comprises a driving rod, a first
piston, a
piston rod and a second piston. The fluid switcher is connected with the first spiral pressure exchange cavity and the second spiral pressure exchange cavity through the piston traps, the first spiral pressure exchange cavity and the second spiral pressure exchange cavity are connected with the
check valve set through the piston traps respectively, spherical isolation pistons are arranged in the first spiral pressure exchange cavity and the second spiral pressure exchange cavity respectively, and the spherical isolation pistons can be trapped by the piston traps. The
fluid pressure energy recovery device has the advantages of being long in service life, small in occupied area, low in
energy consumption and low in liquid mixing rate. The fluid switcher has the advantages of being high in
structural component integration degree, low in switcher body
energy loss, convenient to assemble and maintain and the like.