The invention discloses a device and method for evaluating inhibitor film integrity under scouring work conditions and belongs to the technical field of petrochemical engineering corrosion and protection. The device comprises a supplied flow circulating unit, a shear force measuring unit, an electrochemical monitoring unit, a camera shooting observation unit, a test piece testing unit and an inhibitor injection unit. By means of the device and method, evaluation of integrity of an inhibitor film can be achieved. Firstly, flow shear force is measured through the shear force measuring unit under different scouring work conditions, the corrosion rate is measured through the test piece testing unit, online corrosion monitoring is conducted through the electrochemical monitoring unit, the surface appearance of a test piece is observed and recorded through the camera shooting observation unit, integrity of the inhibitor film is comprehensively evaluated through data comparison and analysis, critical parameters are obtained when integrity of the inhibitor film is damaged, finally an inhibitor is injected through the inhibitor injection unit so that the inhibitor film can be repaired to be complete, and therefore monitoring and evaluation of stability, damage and repair of the inhibitor film are achieved.