The invention discloses a 
loader constant and variable hydraulic 
system based on flow amplifying steering. The 
loader constant and variable hydraulic 
system comprises a hydraulic 
oil tank, a variable pump, a steering gear, a right limiting valve, a left limiting valve, a flow amplifying valve, a left steering cylinder, a right steering cylinder, a flow control valve block, an energy accumulator, a distribution valve, a tipping bucket cylinder, a movable arm cylinder, a 
pilot valve, an unloading valve block, a constant flow pump, a working 
mode switching electromagnetic valve and a working mode selector switch. The small-displacement steering gear is adopted to serve as a hydraulic 
pilot stage of the flow amplifying valve, throttling losses inside a coaxial flow amplifying steering gear in the rapid steering process can be removed, and fuel consumption is reduced; a low-cost home-made element is adopted to replace an inlet element, and steering stability of a variable 
system is achieved; a feedback 
signal of the flow amplifying valve is controlled in a time-shared manner, stability of a 
steering system is improved, and 
energy consumption is reduced; and meanwhile, the energy-saving effect and 
good control characteristics of the variable pump can be played out well, and the energy-saving effect and the control precision of a working system are improved.