Disclosed are a door lock and a door system. The door system comprises a door frame, a door leaf and a door lock, wherein one side of the door leaf is rotationally connected to the door frame, the door lock is arranged on the other side of the door leaf, and the door lock comprises a lock body and a first handle assembly. The lock body comprises a lock shell, a bolt assembly and a shifting sleeve, wherein the bolt assembly is slidably arranged in the lock shell, and the shifting sleeve is rotationally arranged in the lock shell, and is in transmission connection with the bolt assembly; a lock cylinder and an electric motor are arranged on the first handle assembly, a shifting block is rotatably arranged on the lock cylinder, the shifting block is in transmission connection with the shifting sleeve, and an output shaft of the electric motor is in transmission connection with the shifting block; and when a matching key is inserted into the lock cylinder, the shifting block can rotate along with the key. The electric motor is arranged on the first handle assembly without the need to mount the lock body and a transmission structure specially matching the electric motor on the electric motor, such that the structure of the lock body can be simplified, and the thickness and size of the lock body can be reduced; and the shifting block is connected to the shifting sleeve such that the key drives the shifting sleeve to rotate and the electric motor drives the shifting sleeve to rotate, and a transmission chain structure of the whole door lock can be simplified.