The invention relates to the technical field of sludge treatment equipment, in particular to a sludge bin. The sludge bin comprises a bin body and a supporting frame, wherein a feeding port is formedin the upper portion of the bin body, a discharging port is formed in the bottom portion of the bin body, an unloading valve is arranged at the discharging port, a water collecting mechanism used forcollecting leakage water of the unloading valve is arranged below the discharging port, the water collecting mechanism is connected with a water draining mechanism, and the supporting frame is provided with a driving mechanism used for driving the water collecting mechanism to move to the vertical lower portion of the unloading valve and disengage from the vertical lower portion of the unloading valve. The sludge bin has the beneficial effects that when sludge is not unloaded, the water collecting mechanism is moved to the vertical lower portion of the unloading valve to collect the leakage water at the bottom of the bin body, so that the leakage water is prevented from dropping to the ground, the mounting environment of the sludge bin is effectively improved, and the safety is improved; and when the sludge needs to be unloaded, the driving mechanism drives the water collecting mechanism to disengage from the vertical lower portion of the unloading valve, so that the water collecting mechanism is prevented from blocking the sludge, and the damage to the water collecting mechanism caused by sludge falling can be avoided.