The invention discloses a flotation pulp magnetizer which comprises a support frame body, a magnetizer body, a vacuum-pumping system, a distilling water storage tank, an air bag suspension stirring device and a control electric box, wherein a support plate is arranged on the support frame body, and the magnetizer body is arranged on the support plate; the vacuum-pumping system is arranged on one side of the magnetizer body and is connected with the support plate, and the distilling water storage tank is arranged on the other side of the magnetizer body and is connected with the support plate;the air bag suspension stirring device is arranged in the inner part of the magnetizer body, and the control electric box is arranged on one side of the support plate; and the magnetizer body comprises a magnetization tank, a magnetization sleeve and an eddy current oxygen exhauster, and the magnetization tank comprises an end cover and a tank body. According to the flotation pulp magnetizer, theair bag suspension stirring device is arranged in the tank body, a magnetic field is generated in the tank body through the magnetization sleeve at the outer part of the tank body, and a conducting loop is arranged in the air bag suspension stirring device in the tank body. The principle of electromagnetic induction is utilized, the air bag suspension stirring device rotates and crushes ores, andthe contact density of magnetized water and the ores is increased.