The invention discloses a multifunctional electrical characteristic testing device and a multifunctional electrical characteristic testing method for a high-voltage circuit breaker. The testing device consists of a dynamic resistance detection module, a non-synchronism detection module, a displacement sensor, Hall current sensors, a data acquisition card, an industrial control computer and an industrial display screen, wherein a super capacitor is used as a power supply for the detection of loop resistance, and impact current with a peak value of 1,000A is used as detection current. The testing device is a multifunctional testing instrument integrating the detection of loop resistance, closing resistance, closing resistance running time and mechanical characteristics of the high-voltage circuit breaker.