The invention discloses a car door lock for children. The car door lock comprises a switch knob, a push rod, a driven block, an internally-opened handle, a driving block, a switch support and an unlocking stay wire. The switch support is a ring-shaped body and provided with a first stirring shaft winding hole, a switch knob hole and an arc-shaped sliding chute, the switch knob is provided with a rotating shaft and a rotating arm, a push rod sliding chute is formed in the driven block, a boss is arranged on the driving block and a second stirring shaft winding hole is formed in the driving block. The door lock for the children is installed on a rear door of a car, so the rear door of the car can be still opened from the inside on the premise of guaranteeing safety of the children sitting on the back row of the car.