Disclosed is a martial arts training device that is worn on a trainer's waist, and a pair of movable leg-strike units provided on the outer surface of both legs of the trainer are controlled at similar directions, speeds and strengths to real kicking, such that defensive and offensive training simulating a real fight may be performed as the trainee defends from and strikes the movable leg-strike units. The martial arts training device according to the present invention includes a waist-mounted unit worn on a trainer's waist, and a pair of movable leg-strike units, each movably connected to opposite sides of the waist-mounted unit and having a handle on the outer surface thereof to allow a trainer to perform a movable operation thereof.