Hydraulic machine with workpiece positioning function

The invention relates to the technical field of pipe bending equipment, in particular to a hydraulic machine with a workpiece positioning function. The hydraulic machine comprises a first die assembly, a base, a second die assembly and a support frame; the first die assembly is slidably connected with the base; the second die assembly is connected with the first die assembly through the support frame; the first die assembly comprises a first hydraulic cylinder and a first die; the second die assembly comprises a second hydraulic cylinder and a second die; piston rods of the first hydraulic cylinder and the second hydraulic cylinder are provided with floating heads; the floating head on the second hydraulic cylinder is limited to move through the support frame; and the first die and the second die do relative reciprocating motion. According to the hydraulic machine, motion control over the dies is achieved through the hydraulic cylinders; the control stability is good; the problem that in the prior art, the cr