A magnetic coupling device including: a first seat ; a second seat connected to said first seat ; a magnetic unit including a first member that is disposed in said first seat , and a second member that is disposed in said second seat ; and a releasing member connected to said first seat and said second seat , and being convertible between a linked position, where said second seat is proximate to said first seat , and said second member is magnetically connected to said first member , and a released position, where said second seat is away from said first seat , and said second member is separated from said first member ; said releasing member having a connecting end portion that corresponds in position to one of said first seat and said second seat , and a distal end portion that is opposite to said connecting end portion , and that corresponds in position to the other one of said first seat and said second seat ; said first and second members of said magnetic unit being disposed between said connecting end portion and said distal end portion ; characterized in that : said second seat extends along an axis (L); said releasing member is tubular and is rotatable about the axis (L) to convert between the linked position and the released position; said connecting end portion of said releasing member is connected to said first seat and rotatable about the axis (L); and said magnetic unit is surrounded by said releasing member . a first seat ; a second seat connected to said first seat ; a magnetic unit including a first member that is disposed in said first seat , and a second member that is disposed in said second seat ; and a first member that is disposed in said first seat , and a second member that is disposed in said second seat ; and a releasing member connected to said first seat and said second seat , and being convertible between a linked position, where said second seat is proximate to said first seat , and said second member is magnetically connected to said first member , and a released position, where said second seat is away from said first seat , and said second member is separated from said first member ; said releasing member having a connecting end portion that corresponds in position to one of said first seat and said second seat , and a distal end portion that is opposite to said connecting end portion , and that corresponds in position to the other one of said first seat and said second seat ; a connecting end portion that corresponds in position to one of said first seat and said second seat , and a distal end portion that is opposite to said connecting end portion , and that corresponds in position to the other one of said first seat and said second seat ; said first and second members of said magnetic unit being disposed between said connecting end portion and said distal end portion ; characterized in that : said second seat extends along an axis (L); said releasing member is tubular and is rotatable about the axis (L) to convert between the linked position and the released position; said connecting end portion of said releasing member is connected to said first seat and rotatable about the axis (L); and said magnetic unit is surrounded by said releasing member . said second seat extends along an axis (L); said releasing member is tubular and is rotatable about the axis (L) to convert between the linked position and the released position; said connecting end portion of said releasing member is connected to said first seat and rotatable about the axis (L); and said magnetic unit is surrounded by said releasing member . <EOS>