Provided is a method for acquiring continuous physical signal such as temperature, pressure and the like. The method comprises the following steps: inputting a voltage signal u representing continuous physical signal; obtaining a sampled signal uk of an analog voltage through an analog sampling channel (1), wherein the sampling frequency is fΔh; performing digital low-pass filtering on the uk (6) to obtain a voltage signal ũk subjected to low-pass filtering, and resampling the ũk to obtain a resample signal ũj, wherein the resampling frequency fΔy is the same as the sampling frequency required by an application terminal and the sampling frequency fΔh is M times of the resampling frequency fΔy; and storing and outputting the resample signal ũj to the application terminal. Provided also is a corresponding device. The cost of the analog sampling channel is lowered; the ūj can be directly applied to industrial automation for substitution of the ũj, especially output signals do not contain transient values, the requirements of a stable model on input quantity can be met, the random disturbance can be inhibited, and the measurement accuracy can be improved.