The utility model relates to a double-grounding circuit breaker dynamic characteristic analyzer which comprises the components of: a signal generator, a current sampler, test wires, a host computer, and a signal generating and acquiring box. The host computer is connected with the signal generating and acquiring box through a four-wire shielded wire. The signal generating and acquiring box is connected with the signal generator and the current sampler respectively through the test wires. The signal generator and the current sampler are respectively connected with a static contact side grounding blade. The double-grounding circuit breaker dynamic characteristic analyzer can test motion characteristics of switching-off time, switching-on time, period, speed, switching-off voltage, switching-on voltage, etc. on condition that two sides of the circuit breaker are grounded in testing of a high-voltage circuit breaker. The double-grounding circuit breaker dynamic characteristic analyzer has functions of: ensuring high safety of testing equipment and operators, facilitating operation, saving time in detaching a grounding line at one side or switching off a grounding blade at one side, and ensuring complete safety facility on operation field.