The present invention provides a channel measurement system, method, and device. The system includes: a signal collecting device, configured to collect a first signal according to a preset sampling rate, and obtain a second signal, where the first signal is a signal sent by a transmitter without passing through a channel and includes a service signal and a pilot signal; a receiver with measuring function, configured to collect a third signal according to the sampling rate synchronously when the signal collecting device collects the first signal, and obtain a fourth signal, where the third signal is a signal obtained after the first signal passes through the channel; and a channel measuring and processing device, configured to process the second signal and the fourth signal, and obtain a response of the channel. With the channel measurement system, method, and device of the present invention, the channel measurement accuracy is improved without any impact on the operation of a legacy network.