The utility model provides a magnetism pointer liquid level changer, this magnetism pointer liquid level changer includes the floater, the pointer, the dial plate, the quick semi -ring of HALL magnetism, circular magnet and T type pendulum rod, this floater is fixed in the lower extreme of this T type pendulum rod, the liquid storage pot wall is stretched out for one section to this T type pendulum rod pivot, fixed this dial plate in the jar wall outside and the quick semi -ring of this HALL magnetism, stretch out fixed this pointer of shaft ends of this T type pendulum rod of this dial plate, the montant syntropy of sensing and this T type pendulum rod, inboard this the circular magnet that adsorbs of this pointer. This magnetism pointer liquid level changer has signal conversion and teletransmission function, safe explosion -proof, economical and practical, avoided the crude oil storage tank in electric striking sparks cause the detonation accident, avoided jar liquid high temperature state simultaneously under the magneto sensor malfunctioning.