A pet excrement box includes an outer box (1) and an inner tray (2) which is detachable from the outer box (1). The outer box (1) has a V-shaped opening. At least one side of the outer box (1) is formed with an accommodation space (11) to accommodate the inner tray (2). The inner tray (2) has two sides perpendicular to the opening of the outer box (1) and each having a suspension portion (21). The suspension portion (21) is hanged on an edge of the accommodation space (11) of the outer box (1). The pet excrement box of the present invention can dump the excrements on the sands quickly. Ordinarily, the user can use a shovel (3) to clean the excrements on the inner tray (2). It is convenient and hygienic to clean the pet excrement box.
