The invention discloses a simulation method of time parameters in a GNSS navigation signal simulator. The method sets the standard time of a time zone in which a user is located and takes the standard time as the time for starting to receive signals; the receiving time of the standard time zone in which the user is located is converted into the receiving time of UTC time; the receiving time of the UTC time is converted into the receiving time of various navigation system times; signal transmitting times are estimated under the various navigation system times, the relevant time parameters in a navigation message are calculated; the positions of a satellite and the user are calculated under the same time system, the signal transmitting time and the satellite signal spread delay under the time system are obtained by precise calculation; the navigation message and a pseudorange are generated according to the satellite transmitting time of the satellite time. The simulation method realizes the simulation of time parameters in the GNSS navigation signal simulator, the method is not only applicable to the single-system and single-frequency point navigation signal simulator, but also applicable to the multi-system and multi-frequency point navigation signal simulator.