The present invention discloses a paper cup with straw. The paper cup comprises a sectioned-ring-shaped paper sheet for making a cup body and a round paper sheet for making a cup bottom. The sectioned-ring-shaped paper sheet and the round paper sheet are affixed to form the paper cup. An edge of a top arch of the sectioned-ring-shaped paper sheet is provided with at least one protruding rectangular paper sheet that is integrally formed with the sectioned-ring-shaped paper sheet. An edge of a bottom arch of the sectioned-ring-shaped paper sheet is provided with at least one notch corresponding to the protruding rectangular paper sheet. The protruding rectangular paper sheet is rolled via a cylindrical mold to form an upper portion of a straw. A lower portion of the straw is connected to a receiving room of the paper cup via the notch.