The invention discloses a project declaration system based on big data. The project declaration system comprises a data acquisition terminal, a data security module, a server, a data analysis processing module, an auditing module, a feedback module and a declaration module. The system has the beneficial effects that the project information applied by a user can be protected by using the data encryption module, the project information of the user is prevented from being stolen to cause economic loss, the data storage space can be reduced by using the data compression module, and the file storage cost is reduced. The data analysis processing module is used; the specific situation of the project can be evaluated scientifically, normatively and meticulously; randomness, blindness and one-sidedness are avoided, project evaluation quality and level are high, repeated project establishment is avoided, novelty and advancement of projects are guaranteed, audited data are more accurate by arranging the auditing module and the feedback module, and increase of the success rate of declaration is facilitated.