Electrical testing system and method

The invention discloses an electrical testing system and an electrical testing method, wherein the electrical testing system comprises a sensor and a data-acquiring card, wherein the sensor and the data-acquiring card are connected; the sensor is used for detecting the voltage and the current born by an electrical element of an electrical system for a rotary drilling rig; and the data-acquiring card is used for acquiring detecting results which are obtained by the sensor. According to the invention, data is acquired by means of the data-acquiring card, so that the acquiring frequency of the data which is detected by the sensor is increased, and therefore, the measuring precision of electrical testing is improved, and the requirement of overall testing is further met.