The invention discloses a mechanized excrement cleaning system applicable to indoor tethering breeding. The mechanized excrement cleaning system applicable to indoor tethering breeding comprises an inclined cow bed and an excrement cleaning channel formed in the rear portion of the cow bed. The mechanized excrement cleaning system applicable to indoor tethering breeding is characterized by further comprising a movable excrement cleaning device arranged at one end of the excrement cleaning channel, an excrement collection pool arranged at the other end of the excrement cleaning channel, and a controller used for controlling the excrement cleaning device to go forwards, go backwards and be stopped. The excrement cleaning device is driven by a limiting motor; a material sensor is arranged on the side wall of the excrement cleaning channel and is in signal connection with the controller. The mechanized excrement cleaning system has the advantages that the movable excrement cleaning device is adopted for mechanized excrement cleaning, labor intensity of workers is relieved greatly, and the living environment of livestock is improved effectively; the controller controls the excrement cleaning device to go forwards, go backwards and be stopped, maneuverability is high and usage is convenient; the material sensor sends a sensing signal to the controller, the excrement cleaning device is started automatically, and the degree of automation of the excrement cleaning system is improved.