The invention discloses a deformation monitoring data processing method for a single frequency and double frequency GPS hybrid network. The method mainly comprises the steps of carrying out first-stage network computation through double frequency data in a monitoring network and a corresponding precise ephemeris to obtain precise three-dimensional space rectangular coordinates and ionized layer delay correction data of double frequency points; estimating Zenith Tropospheric Delay data of each double frequency point through the Precise Point Position technology; forming a base line network through all monitoring points, adopting L1 carrier wave phase position observed values uniformly to calculate single frequency base lines and adding area ionized layer and troposphere delay correction in the computation process; carrying out traverse adjustment computation with a fixed datum point and double frequency point high precision restraint to obtain coordinates of all the monitoring points; carrying out dynamic filtering on coordinate sequences of the monitoring points through robust Kalman filtering; obtaining deformation information in a computation mode after corresponding coordinate transformation. According to the method, the hardware cost of utilizing a GPS to carry out area deformation monitoring is lowered, and the monitoring accuracy is guaranteed.