A magnetic field stimulator and a cooling method thereof are disclosed. The magnetic field stimulator comprises a stimulating racket (10) and a cooling apparatus (20). The cooling apparatus (20) comprises an internal cooling coil (21), a cooling medium (22) and a cooling cycle unit (23) which cools the cooling medium (22). The internal cooling coil (21) has a first inlet (211) and a first outlet (212) and is set within the stimulating racket (10). The cooling cycle unit (23) installs with a second inlet (231) and a second outlet (232). The first outlet (212) connects with the second inlet (231), and the first inlet (211) connects with the second outlet (232). The cooling medium (22) flows in a passageway composed by the internal cooling coil (21) and the cooling cycle unit (23). The cooling medium (22) circulates through the internal cooling coil (21) and the cooling cycle unit (23) and thus carries away heat, which enables that the whole stimulating racket (10) can obtain cooling continuously. The scheme improves the working stability of the stimulating racket (10), and can be used continuously in practical clinical applications, thereby the risk of high-voltage current leakage of the external water-cooling is avoided and the security is improved.Linvention porte sur un stimulateur de champ magnétique et sur un procédé de refroidissement associé. Le stimulateur de champ magnétique comprend une raquette de stimulation (10) et un appareil de refroidissement (20). Lappareil de refroidissement (20) comprend une bobine de refroidissement interne (21), un milieu de refroidissement (22) et une unité de cycle de refroidissement (23) qui refroidit le milieu de refroidissement (22). La bobine de refroidissement interne (21) a une première entrée (211) et une première sortie (212), et est placée à lintérieur de la raquette de stimulation (10). Lunité de cycle de refroidissement (23) comporte une seconde entrée (231) et une seconde sortie (232). La première sortie (212) est re
