The invention provides a mechanical bar conveying device consisting of a horizontal travel limiting device (1), a vertical axis servo reducer (2), a vertical descent depth detector (3), a vertical axis travelling mechanism (4), a horizontal axis servo reducer (5), a horizontal drive gear (6), a horizontal tow chain (7), a horizontal moving mechanism (8), a manipulator torque detector (9), a safety detection mechanism (10), a main frame (11), a horizontal frame (12), a vertical movement mechanism (16), a tow chain bracket (17), a tow chain (18), a vertical rack-and-pinion mechanism (19), a horizontal linear guide track (20), a vertical beam (21), a claw clamping mechanism (22), a claw ball screw (23), a manipulator servo reducer (24), a manipulator depth detector (25), and a claw and travel limiting combined mechanism (26). The device realizes automatic conveying of bars, and avoids the problems of manual conveying process, such as high environmental temperature, large intensity, low work efficiency and high risk of industrial accidents.