The invention provides an antineoplastic drug screening cell model utilizing STAT3 as target, belonging to the field of biomedicine. The model is created by a reporting system carrier containing an STAT3 specific binding sequence on the basis of active cells with constitutive STAT3, and the model is used for screening treatment medicine of carcinomatous changes and tumors caused by STAT3 constitutive activation. The active cells with the constitutive STAT3 are utilized, so the reporter gene in the model cell is situated at an overactive state, and no additional stimulant is necessary; besides, the obtained stable cell model can be directly used for screening the compounds, thereby not only greatly reducing the screening cost, but also simplifying the whole screening process from cell cultivation, STAT3 activation, compound feed and detection to cell cultivation, compound feed and detection, shortening the screening period, reducing the operation steps, and improving the stability, efficiency and usability of the system, so that the model is more suitable for high throughput medicine screening.