Dual wheel impact type and dual wheel dual jet impact type water turbine generators are applicable in places where water heads are medium and high and water flow is medium and small. There direct types and indirect types with wide applicable range. There are different structures such as dual water chamber, dual propeller wheel and dual jet. The one-way impulse and one-way transmission of ordinary water turbine are changed by new generating units for more balanced, more stable, more efficient and more durable performance. Construction of the foundation is simple and working duration for installation and commissioning is short while operation and maintenance of the unit is easy and convenient.