The invention discloses a GNSS measurement 
control network precision 
estimation method. The method comprises the following steps of 1, based on a 
satellite shielding boundary constraint condition, carrying out visible baseline 
satellite analysis, based on an analysis result, simulating each observation 
station observation value, establishing a double-difference observation equation and solving, and according to a Q 
diagonal matrix in an 
error equation, calculating a relative positioning precision factor of a baseline; 2, carrying out synchronization observation combination screening of target observation points, calculating each baseline DOP value condition of different observation periods, and according to a screened constructed network condition and a precision factor corresponding to the 
observation period, carrying out synchronization ring observation precision 
estimation which is used for selection of a synchronization 
observation point position and the observation periods; and 3, according to a plurality of synchronization rings, carrying out networking, and using a variance 
matrix estimation method of a baseline vector to estimate precision mi of a 
control network. The method is suitable for carrying out GNSS observation in difficult areas of a high-mountain and valley area, an area possessing a 
urban building effect and the like, a precision index is reliable.