The present invention discloses a URTK fuzziness rapid fixing method with additional atmosphere information dynamic constraint. The method comprises the steps of dynamically setting the prior information of the zenith direction tropospheric delay and the observation station satellite direction ionosphere delay at the position of a user by utilizing the position relationship of the user and a reference station, the validity of an atmosphere delay interpolation result at the region of the user and the change of the atmosphere delay along with the local time, taking the residual tropospheric delay and the ionosphere delay as the random walk to-be-evaluated parameters to evaluate, and improving the URTK fuzziness resolution by considering the atmosphere constraint information, such as the space-time change characteristics of a troposphere and an ionosphere. At the URTK fuzziness resolution, and by utilizing the characteristic that the extra wide lane (EWL) /WL observation value wavelength is longer, the fuzziness rapid and effective fixing is convenient, the fuzziness fixing speed of the user can be accelerated effectively.