An excrements cleaning device, includes a cleaning bag, a cleaning supporting unit, and a cleaning bag releasing unit. The cleaning supporting unit includes an upper cover, a lower cover, and an opening elastic verge ring. The upper cover and the lower cover are pressed tightly and assembled fixedly to form a groove for receiving the opening elastic verge ring. The bag mouth is clamped between the groove and the opening elastic verge ring. An opening groove for moving the cleaning bag releasing unit back and forth is formed on a stern of the upper cover. A tensioning locking position and a releasing locking position are formed on a front part and a rear part of the opening groove.
