Die casting device capable of easily replacing metal mold at movable side

The present invention provides a die casting device, which may easily position the metal mold at the movable side and smoothly remove and place the metal mold at the movable side with respect to the main mold at the movable side, thereby easily replacing the metal mold at the movable side while the main mold at the movable side is mounted on the device. The main mold at the movable side is configured with a guide plate for guiding the metal mold at the movable side. The guide plate comprises guiding slots for guiding the guiding pins of the metal mold at the movable side; and a concave portion at the core side formed in parallel to the guiding slots for insertion and engagement of the core. When the metal mold at the movable side is inserted into the concave portion at the movable side of the main mold at the movable side, the outer side of the core may be guided along the inner side of the concave portion at the core side; the outer side of the die block may be guided along the inner side of the concave port