The embodiment of the invention discloses a device and a method for providing test signals. The device comprises a first frequency conversion unit, a second frequency conversion unit and a line matching unit. The first frequency conversion unit is used for converting radio frequency signals output by a tested wireless product into intermediate-frequency signals; the second frequency conversion unit is used for converting the intermediate-frequency signals into high-frequency signals according to a preset frequency, wherein the frequency of the high-frequency signals is the preset frequency; and the line matching unit is used for regulating impedance of a transmission line according to the frequency of the high-frequency signals and outputting the high-frequency signals as test signals. In the technical scheme, as the frequency of signals output by the wireless product is converted twice, the signal after final frequency conversion is the reception signal at the input end of the wireless product to replace vector signal sources and test the reception sensitivity, gain, band fluctuation, and the like of the wireless product. The device for providing test signals is simple, easy and low in cost.