An auto-return apparatus for a glass door comprising: a clamping base, having a base and a securing axle; said base provided for clamping and securing said glass door and comprising an oil reservoir for reserving a hydraulic oil and an axial hole perpendicularly and fluidly connected to said oil reservoir; said securing axle axially attached to said axial hole of said base and comprising an axial shaft and an eccentric cam attached to said axial shaft; said axial shaft comprising a mounting end extended outward from said axial hole; a damper, received within said oil reservoir and abutting said eccentric cam of said securing axle such that the damper is pushed by said eccentric cam to compress said hydraulic oil to generate a resisting force for door opening and closing; the auto-return apparatus being characterized in that it further comprises a misalignment adjuster, having a moving plate to be secured onto the ceiling by at least one securing means; said moving plate comprising at least one long slot and a mounting slot, said long slot provided for said securing means to pass therethrough and to secure thereon, said mounting slot provided for said mounting end of said axial shaft of said securing axle to secure thereon such that said moving plate moves together with said clamping base along an extending direction of said long slot and relative to said securing means and in that said moving plate comprises an adjustable screw hole connected to said mounting slot. said adjustable screw hole extends perpendicularly to said extending direction of said long slot, said misalignment adjuster further comprises an adjustable screw fastened into said adjustable screw hole and penetrated into said mounting slot with an end thereof to abut said mounting end of said axial shaft of said securing axle. a clamping base, having a base and a securing axle; said base provided for clamping and securing said glass door and comprising an oil reservoir for reserving a hydraulic oil and an axial hole perpendicularly and fluidly connected to said oil reservoir; said securing axle axially attached to said axial hole of said base and comprising an axial shaft and an eccentric cam attached to said axial shaft; said axial shaft comprising a mounting end extended outward from said axial hole; a damper, received within said oil reservoir and abutting said eccentric cam of said securing axle such that the damper is pushed by said eccentric cam to compress said hydraulic oil to generate a resisting force for door opening and closing; the auto-return apparatus being characterized in that it further comprises a misalignment adjuster, having a moving plate to be secured onto the ceiling by at least one securing means; said moving plate comprising at least one long slot and a mounting slot, said long slot provided for said securing means to pass therethrough and to secure thereon, said mounting slot provided for said mounting end of said axial shaft of said securing axle to secure thereon such that said moving plate moves together with said clamping base along an extending direction of said long slot and relative to said securing means and in that said moving plate comprises an adjustable screw hole connected to said mounting slot. said adjustable screw hole extends perpendicularly to said extending direction of said long slot, said misalignment adjuster further comprises an adjustable screw fastened into said adjustable screw hole and penetrated into said mounting slot with an end thereof to abut said mounting end of said axial shaft of said securing axle.