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 (31, 32) 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; said releasing member is tubular and is rotatable about the axis 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; 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 (31, 32) 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; said releasing member is tubular and is rotatable about the axis 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; and said magnetic unit is surrounded by said releasing member. said second seat extends along an axis; said releasing member is tubular and is rotatable about the axis 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; and said magnetic unit is surrounded by said releasing member.