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In the large-capacity millimeter-wave communication system, the ultra-high transmission rate makes it difficult for the hardware unit to achieve frame synchronization in real time. Therefore, reducing the algorithm complexity of the frame synchronization method is the key to real-time frame synchronization in large-capacity millimeter-wave communications. For the problem of high complexity of traditional frame synchronization methods in large-capacity millimeter-wave communication scenarios, a low-complexity time-frequency joint frame synchronization scheme is proposed. This scheme simplifies the realization of frame synchronization by combining coarse synchronization in time domain and fine synchronization in frequency domain, reduces the complexity of frame synchronization algorithm, and provides a feasible scheme for real-time frame synchronization of large-capacity millimeter wave systems. The simulation results show that the proposed scheme is 7dB lower than the threshold SNR of Park's method and 1dB higher than that of Meng's method. The algorithm complexity is reduced from O(N2) level of Meng's or Park's method to O(Nlog2N) level.