The invention discloses a carrier smoothing pseudo-code ranging device and method based on non-coherent measurement. The method comprises the following steps that pseudo code phase and carrier frequency doppler synchronous tracking and modulation and demodulation are carried out on the received AD sampling data; the modulation and demodulation downlink signal pseudo-code phase is counted, a downlink pseudo-code phase counting value are obtained and recorded, and smoothing operation is carried out; frequency-carrying doppler measurement is carried out on the synchronously-tracked downlink signal, and the downlink carrier frequency doppler is obtained and recorded; the uplink carrier frequency doppler and the uplink pseudo code phase counting value are extracted, the downlink carrier frequency phase change quantity is obtained according to the uplink and downlink carrier frequency doppler, and the uplink pseudo code phase count value is subjected to smooth operation; and according to thesmoothed uplink and downlink pseudo-code phase count values and the downlink carrier frequency phase variation quantity, the space transmission time delay is obtained through calculation, and a ranging result is obtained. The device and method are suitable for the requirement that the precision of the ranging result is high in a non-coherent spread spectrum mode, existing satellite-borne responseequipment does not need to be changed, and the high-precision ranging effect can be achieved.