Door opening and closing device with lock for zero distance elevator

The invention discloses a door opening and closing device for an elevator, which is a main part of the elevator. When the elevator operates, interlocking door-opening double poles (7) with molded line track slots of the door opening and closing device are positioned within a sill of a car; when door opening and closing are carried out at an elevator horizontal layer, the interlocking door-opening double poles (7) exceed the sill of the car and a sill of a layer door; a layer door opening and closing roller (10) is always positioned within the sill of the layer door, so that the distance from the sill of the car to the sill of the layer door is shortened and a necessary motion clearance is only reserved between the sill of the car and the sill of the layer door; and in the process of opening and closing the door of the elevator, a locking hood (14) is automatically unlocked and locked.