The invention provides a multi-core parallel calculation method for weather radar data. The multi-core parallel calculation method is characterized by comprising the following steps of firstly memorizing detected weather radar observation data by a spherical coordinate system, secondly carrying out lattice formulation on the memorized spherical coordinate data, namely interpolating the radar datawith non-uniform spatial resolution under the spherical coordinate system into the unrelated lattice data with uniform spatial resolution under the uniform Descartes coordinate; thirdly utilizing an OPENMP program to lead the lattice data to enter corresponding CPU cores for calculation under the control of respective threads, thus obtaining the corresponding weather data; and finally synthesizing the data obtained by the calculation of each CPU core, thus obtaining the required weather data. By adopting the multi-core parallel technology, the maximum utilization ratio of a CPU can achieve 97%, the operation capability of a computer can be used sufficiently, and the real-time characteristic of the weather data calculation analysis can be improved.