A motor-driven door ratchet for a vehicle, the door ratchet comprising: a catch part configured to lock a vehicle door to a vehicle body by being caught by a striker mounted on the vehicle body or to be detached from the striker to allow the vehicle door to be opened from the vehicle body; a door locking and release part that includes a main motor, the door locking and release part configured to allow the catch part to be locked or released from the striker by applying a rotational force to the catch part through the main motor; an emergency door release part that includes an auxiliary motor, an inside emergency operation lever and an outside emergency operation lever; wherein the emergency door release part is configured to allow the auxiliary motor to be operated to open the vehicle door from the vehicle body through the catch part; wherein the inside emergency operation lever is connected to an inside handle installed in the vehicle door, wherein the inside emergency operation lever is configured to allow the vehicle door to be opened by applying torque to the catch part; and wherein the outside emergency operation lever is connected to an outside handle installed in the vehicle door, wherein the outside emergency operation lever is configured to allow the vehicle door to be opened by applying torque to the catch part, characterized in that the inside emergency operation lever is configured to be rotated by receiving a manipulation force to allow the vehicle door to be opened by applying torque to the catch part, the outside emergency operation lever is configured to be rotated by receiving a manipulation force to allow the vehicle door to be opened by applying torque to the catch part, the emergency door release part further includes an emergency key lever, a master locking link and a key nut, the key nut is coupled to a key cylinder capable of having a vehicle key inserted therein to rotate according to a rotation operation of the vehicle key, and when a user of a vehicle inserts the vehicle key into the key cylinder and rotates the key nut by rotating it, the emergency key lever and the master locking link are pushed by an accommodating groove wall of the key nut to allow it to be in a door opening standby state. a catch part configured to lock a vehicle door to a vehicle body by being caught by a striker mounted on the vehicle body or to be detached from the striker to allow the vehicle door to be opened from the vehicle body; a door locking and release part that includes a main motor, the door locking and release part configured to allow the catch part to be locked or released from the striker by applying a rotational force to the catch part through the main motor; an emergency door release part that includes an auxiliary motor, an inside emergency operation lever and an outside emergency operation lever; wherein the emergency door release part is configured to allow the auxiliary motor to be operated to open the vehicle door from the vehicle body through the catch part; wherein the inside emergency operation lever is connected to an inside handle installed in the vehicle door, wherein the inside emergency operation lever is configured to allow the vehicle door to be opened by applying torque to the catch part; and wherein the outside emergency operation lever is connected to an outside handle installed in the vehicle door, wherein the outside emergency operation lever is configured to allow the vehicle door to be opened by applying torque to the catch part, characterized in that the inside emergency operation lever is configured to be rotated by receiving a manipulation force to allow the vehicle door to be opened by applying torque to the catch part, the outside emergency operation lever is configured to be rotated by receiving a manipulation force to allow the vehicle door to be opened by applying torque to the catch part, the emergency door release part further includes an emergency key lever, a master locking link and a key nut, the key nut is coupled to a key cylinder capable of having a vehicle key inserted therein to rotate according to a rotation operation of the vehicle key, and when a user of a vehicle inserts the vehicle key into the key cylinder and rotates the key nut by rotating it, the emergency key lever and the master locking link are pushed by an accommodating groove wall of the key nut to allow it to be in a door opening standby state.