The invention discloses a conflict prediction method under approach control airspace height limitation, which comprises the following steps: a, extracting flight intention information of aircrafts; b,determining a horizontal track and a speed profile; c, displaying a trajectory profile; d, setting an early warning advance period; e, setting a conflict alarm threshold; f, designing a conflict detection method; g, correcting error; and h, acquiring and displaying conflict detection maps. According to the invention, automatic conflict detection for the approach control airspace is realized, andthe workload of approach controllers is reduced.