The invention discloses an automatic cleaning-type waste liquor collecting and discharging device, and solves the problems that in the prior art, a pipeline used for discharging waste liquor is blocked by waste liquor crystallization, while high labor capacity, high leaking possibility and low safety are caused by manual waste liquor bucket transportation. The automatic cleaning-type waste liquor collecting and discharging device comprises a clear water bucket, the waste liquor bucket, a valve and a lever, wherein a discharging pipe connected to the bottom of the waste liquor bucket is also connected to a waste liquor pool in a lower position; due to the siphon principle, when the liquid level in the waste liquor bucket reaches the highest position of the discharging pipe, the discharging pipe starts to continuously discharge waste liquor automatically; the clear water bucket is connected with the waste liquor bucket through a connecting pipe; the valve is arranged on the connecting pipe; a floating ball is suspended in the waste liquor bucket; the floating ball is connected with one end of the lever; the other end of the lever is connected with the valve; the switching on/off of the valve is controlled through the floating ball and the lever, so as to control clear water entering the waste liquor bucket. Therefore, the discharging pipe can be cleaned with clear water automatically to avoid pipeline blockage caused by waste liquor crystallization; the structure is simple; the cost is low; the automatic cleaning-type waste liquor collecting and discharging device is convenient to use and practical.