Provided are a thunderstorm day automatic recording system applied to a meteorological station and a recording method thereof. The system comprises one or more thunderstorm day automatic recording devices and a remote server. Each thunderstorm day automatic recording device comprises an electrical field planar antenna, a microphone array, a solar cell panel, a GPS antenna, a terminal and a support, wherein the electrical field planar antenna, the microphone array, the solar cell panel, the GPS antenna and the terminal are all mounted on the support. Each microphone array is composed of a plurality of microphones which are symmetrically and evenly distributed on a planar circular array around the support by a certain distance. The thunderstorm day automatic recording devices are in communication with a 3G network through a 3G communication module, and meanwhile the remote server is connected to the 3G network through an INTERNET. The thunderstorm day automatic recording system applied to the meteorological station has the advantages that the happening time and the direction of thunderstorms are automatically recorded, thunderstorm data are sent to the remote server, the starting and stopping time and the starting and stopping direction of each thunderstorm process are counted by the remote server, the year thunderstorm days in an area under administration of an observation station are calculated, the cost is low, and simpleness and reliability are achieved.