The invention relates to the technical field of medical apparatuses for treating eye diseases, in particular to a manual self-locking rotation-angle structure. The manual self-locking type rotation-angle structure comprises a rotating assembly and a self-locking assembly, and the self-locking assembly comprises a connecting piece, a spring, a first rotating self-locking piece, a second rotating self-locking piece, a rotating piece and a manual knob; in the manual self-locking rotation-angle structure, manual operation is conducted to rotate the manual knob to drive the rotating piece to rotate, and therefore the second rotating self-locking piece is jacked up to make the second rotating self-locking piece and the first rotating self-locking piece separated, at the same time, the rotating piece drives the first rotating self-locking piece to rotate, the first rotating self-locking piece drives the connecting piece to rotate, then the rotating assembly is driven to rotate, when the rotating assembly rotates to an appropriate angle, the manual knob stops rotating and loosens, the spring jacks back the first rotating self-locking piece to make the first rotating self-locking piece and the second rotating self-locking piece engaged, so that the first rotating self-locking piece is locked and does not rotate and move due to self-weight axial inertia.