The present invention provides a mold frame for curved displaying and a curved liquid crystal display device using the mold frame. The mold frame for curved displaying includes two opposite first side frame members (11) and two opposite second side frame members (13) respectively mounted to two ends of the two first side frame members (11). Each of the first side frame members (11) includes a plurality of first engagement slots (115) and open notches (117) between two adjacent ones of the first engagement slots (115) formed therein. The first engagement slots (115) receive and are coupled to the first projection blocks (211) of the curved backplane the first side plates (21). The first side frame members (11) are made of an elastic plastic material. The first side frame members (11) show a flat and straight configuration before being assembled to a curved backplane and show a curved configuration after being assembled to the curved backplane. The mold frame for curved displaying has a simple structure is easy to design, manufacture, and inspect so as to help improve product yield rate and reduce manufacture costs.