The invention provides a low-frequency magnetic field generating device.The system comprises a cover body and a circuit module.The circuit module is arranged in the cover body.And the circuit module can generate a magnetic field signal.The magnetic field signal is filtered and amplified by conversion and noise into a low-frequency magnetic field in the frequency range of less than 10 Hz, and is sent outside the hood by the transmitting unit.So that users of the outer environment space of the cover can adjust their sleep state after receiving the low-frequency magnetic field.Speed up users' deep sleep.The utility model further improves the sleep quality of the user.本創作係提供一種低頻磁場產生裝置，係包括：一罩體及一電路模組，該電路模組係設置於所述罩體內，且該電路模組可產生有一磁場信號，其磁場信號經由轉換及雜訊濾除及放大為小於10赫茲頻率範圍間之低頻磁場且由發射單元送至罩體外，以使罩體外環境空間之使用者接收其低頻磁場後可調節自身之睡眠狀況，加快使用者進入深度睡眠狀態，進而提高使用者睡眠品質之功效者。
