The present invention discloses a Beidou IGSO/MEO satellite pseudo-range code deviation one-step modeling method. An original phase observed value is subjected to cycle slip detection to determine whether a phase observed value in each frequency at a current epoch is set as a reference epoch or not, pseudo-range code deviation of a receiver is neglected based on an MP (Multi-Path) combination observed value, and each observation station MP combination observed value of each epoch is subjected to weighing according to a satellite elevation and then reference epochs with the same arc section aresubtracted from each observation station MP combination observed value of each epoch to accurately eliminate unknown integer ambiguity parameters so that the pseudo-range code deviation of a single satellite in each frequency is added into a same method equation to comprehensively solve a three-order polynomial correction model coefficient, the pseudo-range code deviation related to an elevatingangle of each satellite in each frequency is accurately corrected to an extreme, stability of a code-phase combination observed value of the Beidou satellite is improved, and the Beidou IGSO/MEO satellite pseudo-range code deviation one-step modeling method has an important meaning for shortening fuzziness convergence time.