Hydraulic stepless speed regulating system of quantitative hydraulic pump

The utility model relates to the technical field of hydraulic transmission, in particular to a hydraulic stepless speed regulating system of a quantitative hydraulic pump, which comprises an oil inlet module, an oil outlet module, a multi-connected hydraulic coaxial motor, an oil inlet direction valve group, an oil outlet direction valve group and a controller. The oil inlet direction valve group is communicated with the oil inlet module, and the outlet end of the oil inlet direction valve group and the inlet end of the oil outlet direction valve group are respectively communicated through the inlet end and the outlet end of the multi-connected hydraulic coaxial motor; the oil outlet direction valve group is communicated with the oil outlet module; the multi-connected hydraulic coaxial motor comprises a plurality of first hydraulic motors and connecting shafts, and the driving ends of every two adjacent first hydraulic motors are connected through the corresponding connecting shaft. The controller is electric