The invention discloses a pedestal pan capable of achieving automatic flushing. The pedestal pan is composed of a pedestal pan body, a water tank, a cushion and a connection device. The water tank (1) is internally provided with a water inlet valve (2) and a drainage valve (3). The water inlet valve (2) is provided with two partitions, the inner partition (19) is provided with a small hole (20), and the outer partition is a container partition (8). The water tank (1) is provided with a switch (21) of a small water inlet valve (23). The pedestal pan is provided with a mechanism for discharging water for flushing. A drainage valve cover plate is connected with a floating ball (5). A spring (12) and a spring shaft (13) are arranged in a support (24) and fixed to a support hole (11), the cushion (15) is arranged on the spring shaft (13), and the lower end of the spring shaft is movably connected with a pull rod (14). One end of the pull rod enters the water tank (1) through a channel pipe (10) and is connected with a container partition handle (9) and a floating ball handle (6). In this way, when the mechanism is toggled, water can be discharged to flush the pedestal pan, water conservation is achieved and the pedestal pan is convenient to use.