A sensing escape device of an automatic cleaner includes a control module, a motion module and an inclination limitation sensing module. The control module controls the motion module to drive the movement of the automatic cleaner in mode between a forward mode with head portion as a head and a backward mode with tail portion as a head. The inclination limitation sensing module coupled to the control module includes a critical inclination angle sensing unit outward disposed on a rear bottom of the main body. When the critical inclination angle sensing unit is externally contacted, the inclination limitation sensing module generates a signal and transfers the signal to the control module, to make the control module drive the motion module to switch into the backward mode. The automatic cleaner moves backward immediately when climbing a ramp, to avoid misjudging actions such as a suspension of the motor-driven wheel unit.