The invention provides a non-contact adaptive echo cancellation device and an echo cancellation method. The device comprises an adaptive identification filter (10) and a non-contact measurement device(7), wherein an output end of the non-contact measurement device (7) is connected with an input end of the adaptive identification filter (10), and the non-contact measurement device (7) emits laseror ultrasonic wave to a speaker diaphragm (6), and measures a reflected signal of the laser or the ultrasonic wave so as to acquire and use a signal reflecting vibration information of the speaker diaphragm as a reference signal of the adaptive identification filter (10). When the echo cancellation method is used to cancel echo based on the device, adverse effects of non-linear change of transmission from a speaker driving current signal to a sound signal on the adaptive identification filter can be prevented, and the convergence performance of the filter is improved; and the echo suppressionquantity in adaptive echo cancellation is increased, so that the system performance is improved.