Signal test system, method and device, and oscilloscope

The invention provides a signal testing system, method and device and an oscilloscope. The signal testing system comprises an oscilloscope, a first probe and a second probe, the first probe is respectively connected with the oscilloscope and a test object; the first probe is used for collecting a first signal of a test object and transmitting the first signal to the oscilloscope; the second probe is connected with the oscilloscope; the second probe is used for collecting a signal in a test environment in which the test object is located and filtering the signal to obtain a second signal with the same bandwidth as the first signal, and transmitting the second signal to the oscilloscope; and the oscilloscope is used for correcting the first signal by using the second signal to obtain a third signal.