The invention relates to an intelligent lock with a lock cylinder protecting function based on an internet of things. The intelligent lock comprises a main body, a keyboard, a lock cylinder and a handle, and further comprises a protecting mechanism, a cleaning mechanism and a central control mechanism; the protecting mechanism comprises a rotating shaft, a sleeve, a ring, a first driving module, aconnecting module and two transmission modules; the transmission modules comprise support rods, springs, slide blocks, second transmission rods and first transmission rods; and the cleaning mechanismcomprises a lifting rod, a cleaning block, two second driving modules and two lifting blocks. In the intelligent lock with the lock cylinder protecting function based on the internet of things, through the protecting mechanism, the clutching between the handle and the lock cylinder is realized; when the intelligent lock is in a locking state, the influence on the lock cylinder by rotation of thehandle is reduced, and the breakdown probability of the intelligent lock is reduced; and through the cleaning mechanism, dust and water on the keyboard can be cleaned, so that the cleanness of the keyboard is improved, and the sensitivity of the keyboard is improved.