The invention discloses a cantilever beam slip posture monitoring device. The cantilever beam slip posture monitoring device comprises a first group of displacement sensors, a second group of displacement sensors and a display device, wherein the first group of the displacement sensors is used for detecting the offset of a cantilever beam in a slipping process at a first position, and generating a first offset signal; the second group of displacement sensors is used for detecting the offset of the cantilever beam in the slipping process at a second position, and generating a second offset signal; the display device is used for displaying a first offset instruction according to a first offset signal and displaying a second offset instruction according to a second offset signal; the first offset instruction indicates the offset of the cantilever beam relative to a slipping center line at the first position, and the second offset instruction indicates the offset of the cantilever beam relative to the slipping center lien at a second position. By adopting the cantilever beam slip posture monitoring device, the sensors are used for monitoring the offset of the cantilever beam in the slipping process in real time, thus an operator can make adjustment in time.