The present invention provides a device and a method for testing the clock or signal drive loading capability. The device at least comprises a loading unit, a monitoring and control unit, and a person-machine interface, wherein the loading unit comprises a selecting module and an analog loading module, and connects with a tested object and the monitoring and control unit; the monitoring and control unit comprises a monitoring unit and an analysis control module, the monitoring and control unit is connected with the loading unit and the person-machine interface, of which the monitoring unit comprises a performance value acquisition module and a calculating index module; and the person-machine interface comprises a result display module and an input module, and connects with the monitoring and control unit. The device and the method of the present invention can automatically test the loading capacity of the tested object and the parameters of the measured signals under the circumstance of sundry loading; and assess the extreme drive capability of the tested signal. The device is of more authenticity than an EDA tool, which is favorable for improving the reliability and stability of products. At the same time, using the device and the method saves time and labor, and can improve the working efficiency and conduce to the shortening of the product development period.