The invention discloses a desulfurization tower limestone slurry liquid level measuring device. The desulfurization tower limestone slurry liquid level measuring device comprises a desulfurization tower main body; the desulfurization tower main body comprises a pulley, a force moment transmitter, a communicating vessel, a gravity floating ball, a slurry pump, a motor, a controller, and an atomizing device; the motor is arranged on the upper end of the desulfurization tower main body; one end of the motor is connected with the pulley; the upper end of the desulfurization tower main body is fixedly connected with the force moment transmitter; the force moment transmitter is arranged below the pulley; the communicating vessel is arranged at the middle part of the desulfurization tower main body; the pulley is arranged above the communicating vessel; the gravity floating ball is arranged in the communicating vessel; the gravity floating ball is connected with the pulley through a rope. Inoperation, the motor is used for driving the gravity floating ball to rise or decrease to realize accurate measuring of slurry liquid level of the desulfurization tower, a problem in the prior art that slurry overflow is caused by reduced or overhigh desulphurization efficiency because of low liquid level caused by measuring errors is solved, and desulphurization equipment safe operation is ensured.