Signal sampling device and method

The invention relates to a signal sampling device and a method. The signal sampling device comprises a central processing unit, an input interface module and an output interface module. The input interface module and the output interface module are respectively connected with the central processing unit; the input interface module comprises a first signal input circuit and a second signal input circuit, the first signal input circuit is used for inputting original signals into the central processing unit, the second signal input circuit is used for amplifying the original signals and inputting amplified signals to the central processing unit; and the central processing unit is used for respectively sampling the original signals and the amplified signals and outputting results of sampling of the original signals through the output interface module when the current value of the original signals is higher than the preset threshold value, or outputting results of sampling of the amplified signals through the outp