The invention discloses a wireless receiver, which comprises a gain amplifier arranged on a master signal channel, and an analog-to-digital converter, a digital signal processor (DSP) and a digital-to-analog converter which are sequentially connected to a feedback channel. The invention further discloses a method for eliminating direct current offset voltage, which comprises the the following steps: a master signal is amplified via a gain amplifier on the master signal channel, the analog-to-digital converter on the feedback channel detects the size of the direct current offset voltage outputted from the gain amplifier and the size of 1/f noise and converts to digital signals, DSP carries out low-pass filtering of the digital signals converted by the analog-to-digital converter and calculates actual digital signals, and the digital analog converter converts the digital signals subjected to DSP filtering and calculation to feedback analog signals which can counteract the direct currentoffset voltage and the 1/f noise of the master signal. The invention can dynamically and accurately measure the size of the direct current offset voltage and the 1/f noise by using dynamic feedback method, and can carry out real-time elimination, thereby ensuring correct demodulation of the wireless receiver.