Opening and closing mechanism of intelligent door lock and intelligent door lock

The utility model relates to an opening and closing mechanism of an intelligent door lock and the intelligent door lock, the opening and closing mechanism comprises a shell, a latch bolt assembly, a dead bolt assembly, a first transmission assembly and a second transmission assembly, and the shell is used for being installed with a door body; the latch bolt assembly comprises a latch bolt, and the latch bolt extends out of or retracts into the shell in the width direction of the shell. The dead bolt assembly comprises a rack and a dead bolt, the dead bolt extends out of or retracts into the shell in the width direction of the shell, and the rack is connected with the dead bolt; the first transmission assembly comprises a shifting piece, a first gear and a first transmission piece, the shifting piece is connected with the latch bolt assembly, the first transmission piece is connected with the first gear and located on the same plane with the shifting piece, the first gear rotates to drive the first transmissio