Based on the wind speed data from 122 national meteorological observation stations in Shandong and ERA-Interim reanalysis data provided by ECMWF, the strong winds and corresponding low-frequency atmospheric circulations in Shandong from September 2015 to September 2020 are analyzed by using wavelet analysis and band-pass filtering. The results are as follows. The frequency of strong winds in Shandong has increased in recent years with the highest frequency in spring and the lowest in autumn; the most frequent strong winds occur in the east of Shandong Peninsula and the least in the south of Shandong Province; the southerly winds are more frequent than northerly winds only in July for the whole year, while the northerly winds are dominant in other months. The frequency of strong winds in Shandong has significant low-frequency oscillation periods of 11-13 d and 20-23 d, among of which the oscillation period of 11-13 d is dominant in spring and the oscillation period of 20-23 d in autumn and winter, and the oscillation period in summer is not obvious. The evolution of oscillation period relates to the large-scale strong wind process, which occurs roughly at the peak of the oscillation wave. When the northerly strong winds are prevailing in spring, they are often accompanied by the propagation of meridional winds from north to south. In autumn, the meridional winds are propagated from south to north in the middle and upper troposphere on the north of 35°N and from north to south on the south of 35°N, while the propagation is opposite in the middle and lower troposphere. Before the occurrence of strong winds in spring in Shandong, the low-frequency cyclone over the east of the Ural Mountains and the low-frequency anticyclone over the Yellow Sea simultaneously appear and move eastward, and then the low-frequency anticyclone over North China and low-frequency cyclone over the Bohai Sea are derived. The strengthening of these two systems promotes the increase of the northerly winds over North China, which makes possible the occurrence of strong winds in Shandong. At the same time, the positive anomalies of meridional winds are gradually replaced by the negative anomalies over North China, which is another precursor of strong winds in Shandong.