A prefabricated dinosaur model comprising: a skeleton frame including a head bone part, a neck bone part, a trunk bone part, a tail bone part, and a leg bone part, and forming a skeleton corresponding to an appearance of the dinosaur when assembled; a joint connection part provided at a connection portion of the skeleton frame to enable movement of the skeleton frame; and an outer skin including a head skin part coupled to an outer side of the head bone part, a neck skin part coupled to an outer side of the neck bone part, a trunk skin part coupled to an outer side of the trunk bone part, a tail skin part coupled to an outer side of the tail bone part, and a leg skin part coupled to an outer side of the leg bone part, characterized in that the head skin part, the neck skin part, the trunk skin part, the tail skin part, and the leg skin part are detachably coupled directly to corresponding parts of the skeleton frame, the head bone part includes a skull, and a jawbone moveably coupled to the skull to open and close a mouth, a first hinge member is rotatably connected to an inner side of the skull, and a second hinge member is rotatably connected to an inner side of the jawbone and also connected to the first hinge member, a rotating shaft is provided at a location where the first hinge member and the second hinge member are connected to each other, and a tongue is protrudingly provided at a side of the rotating shaft, and the tongue is moved back and forth in response to movement of the jawbone with respect to the head bone part such that a fore end portion thereof is moved in and out of the head bone part. a skeleton frame including a head bone part, a neck bone part, a trunk bone part, a tail bone part, and a leg bone part, and forming a skeleton corresponding to an appearance of the dinosaur when assembled; a joint connection part provided at a connection portion of the skeleton frame to enable movement of the skeleton frame; and an outer skin including a head skin part coupled to an outer side of the head bone part, a neck skin part coupled to an outer side of the neck bone part, a trunk skin part coupled to an outer side of the trunk bone part, a tail skin part coupled to an outer side of the tail bone part, and a leg skin part coupled to an outer side of the leg bone part, characterized in that the head skin part, the neck skin part, the trunk skin part, the tail skin part, and the leg skin part are detachably coupled directly to corresponding parts of the skeleton frame, the head bone part includes a skull, and a jawbone moveably coupled to the skull to open and close a mouth, a first hinge member is rotatably connected to an inner side of the skull, and a second hinge member is rotatably connected to an inner side of the jawbone and also connected to the first hinge member, a rotating shaft is provided at a location where the first hinge member and the second hinge member are connected to each other, and a tongue is protrudingly provided at a side of the rotating shaft, and the tongue is moved back and forth in response to movement of the jawbone with respect to the head bone part such that a fore end portion thereof is moved in and out of the head bone part.