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Because of the big demand of navigation signals which need to be simulated, in the process of the design of multi-mode GNSS signal simulator, how to rectify the unsynchronized packets caused by the difference of several applications’ boot time and how to generate time-synchronized intermediate-frequency signal by controlling different IF boards become the key problems. Aiming at these problems, an algorithm for the time synchronization control based on GNSS signal simulator was proposed, which can applied to the GNSS signal simulator which adopt the software radio system architecture. Meantime, the control of generating synchronous IF signal by the peripheral boards by the system timing board, the control of 1s slot synchronization of driver software and peripheral boards and the control of packet synchronization that diver software transmitted to the peripheral boards were used to carry out the time synchronization control of different satellite navigation system. In addition, the proposed algorithm could support the continuant and stable work of multi-mode GNSS signal simulator for a long time, and exhibit the advantages of high time synchronization precision and low system complexity. By the multi-satellite joint location test, it is proved that the output signal of multi-mode GNSS signal simulator is time synchronization.