At present, the basic electrical parameters measurement of most power generation units, still adopt the method of electrical measuring transducer with low degree of integration and intelligence. The measurement method has the disadvantages of complex maintenance, high maintenance cost, large space of equipment, failure information can not being uploaded in time and so on. This paper introduces a kind of intelligent electric power parameter measuring instrument for generator based on STM32. The software algorithm and hardware design scheme of the system are described. The measurement data can be quickly and easily communicated to the field bus and the working efficiency is greatly improved.