The invention discloses a mixed-flow type water pump turbine. The mixed-flow type water pump turbine comprises a volute, fixed guide vanes, movable guide vanes, a turning wheel and an exhaust water pipe, wherein the turning wheel is located at the middle part inside the volute; the fixed guide vanes and the movable guide vanes are distributed inside the volute and are located near the turning wheel; the exhaust water pipe is connected to the middle part of the bottom of the volute; the turning wheel is mainly composed of an upper canopy, a lower ring and vanes; the vanes are located between the upper canopy and the lower ring and are distributed along the circumference of the lower ring in groups; each group of the vanes is composed of a long vane, an intermediate van and two short vanes; one short vane serves as a first short vane and is located between the long vane and the intermediate vane of the group of the vanes while the other short vane serves as a second short vane and is located between the intermediate vane of the group of the vanes and the long vane of the adjacent group of the vanes. The bending degree of the curve in an S region is reduced obviously, the secondary flow loss is lower, the flowing property of a flow field is improved, the running stability of a machine set is guaranteed, and the likelihood of occurrence of vibration of the machine set is reduced.