The utility model relates to a rotation type children's safety seat, including mount pad, rotatable automobile seat and locking positioning mechanism, locking positioning mechanism is including setting up location latch hook and the location lockhole unit on the mount pad, and location lockhole unit includes first location lockhole and the second location lockhole that sets gradually along the fore -and -aft direction of seat, and the automobile seat has two operating position, inserts first location lockhole when the location latch hook, locks positioning mechanism and locks, and the automobile seat is at an operating position, insert the second when the location latch hook and fix a position the lockhole, the locking of locking positioning mechanism, the automobile seat is in the 2nd operating position, break away from first location lockhole, second location lockhole, the unblock of locking positioning mechanism, the mount pad rotation relatively of automobile seat when the location latch hook. The utility model discloses a locking and unblock that the location latch hook inserted or broke away from first location lockhole or second location lockhole realization automobile seat and mount pad realize two operating position's of automobile seat conversion, convenient operation simultaneously.