Ore pulp liquid level detection device

The invention discloses an ore pulp liquid level detection device which comprises a detection pipe, a vertically-arranged magnetostriction liquid level sensor with a floating ball is clamped in the upper end section of the detection pipe, a diaphragm piece is connected to the bottom of the detection pipe in a sealed mode, and the portion, between the diaphragm piece and the floating ball, in the detection pipe is filled with transformer oil. And a plurality of air holes are formed in the detection pipe above the floating ball. According to the invention, the pressure balance at the diaphragm is utilized, the oil level change of transformer oil reflects the ore pulp liquid level change, and the ore pulp liquid level is detected by measuring the oil level, so that the floating ball is prevented from being corroded and attached by ore pulp, and the measurement precision is higher; the small density of transformer oil is utilized to amplify the change of the ore pulp liquid level, so that the measurement precisio