A rapid prototyping apparatus includes a construction platform, a movable platform, and a page-width array printing module. The construction platform includes a construction chamber. The movable platform and the construction platform are movable relative to each other. The page-width array printing module includes plural inkjet head structures. The printing platform and the movable platform are synchronously moved along a single direction in a reciprocating motion. The plural inkjet head structures are collaboratively defined as at least one page-width array printing unit. The plural inkjet head structures include respective inkjet chips. The inkjet chips are arranged in plural rows and in a staggered form, so that a printing width of the inkjet chips is larger than or equal to a width of a printed pattern. Moreover, at least one monochromatic print liquid is introduced into the construction chamber from the plural inkjet head structures.