The invention discloses a cross-platform time synchronization apparatus and method, which is characterized in that at least two cross-platform time synchronization apparatuses are combined with own time-frequency devices of platforms via a point-to-point radio or an IP network and other communication links, and a synchronizing system is formed with respective data transmission devices to achieve high-precision time consistency of different platforms; by adopting the data transmission common view comparison and high-performance taming clock technology, the mode that the original time-frequencydevice only pays attention to providing timing signals, but cannot provide high-precision in-phase frequency reference signal in real time is changed; the precision correct between two units is realized by using wireless two-way comparison, and the high-performance taming clock is used for realizing the time service ability and the high-precision frequency scale output of independent nodes so as to reform the original pyramid structure into a distributed video structure. Any node fault can obtain a high-precision time scale and a frequency scale from another node through a distributed time-frequency network. The problem of high-precision time unification between different sport platforms without satellite timing signal can be effectively solved, and the military significance and the economic benefit are obvious.