The invention relates to a crane hydraulic 
system for a load sensitive ship, which comprises an electric proportional 
handle, a PLC main command controller, a 
control system and a power source, wherein the 
control system comprises an integrated electric liquid proportional 
reversing valve, an integrated two-way reducing valve, an integrated pressure stop valve, a load sensitive 
pilot control valve, a 
pressure sensor, a balance valve, a secondary overflow valve, a 
motor variable control valve and a two-stage 
electric control axial 
plunger variable motor that are connected through an oil pipeline; the power source comprises a load sensitive valve, an integrated 
electric control pressure stop valve, an axial 
plunger variable pump and a one-way valve that are connected through an oil pipeline; the PLC main command controller is respectively connected with the integrated electric liquid proportional 
reversing valve, the load sensitive 
pilot control valve, the 
pressure sensor, the 
motor variable control valve and the integrated 
electric control pressure stop valve through electric control signals; and the 
control system is connected with the power source through an oil pipeline. The invention can not only realize real-
time control and higher accuracy, but also has stronger 
automation and better energy-saving effect.