The invention provides an adjustable pedal structure used for a toilet. The adjustable pedal structure includes a toilet body and a matched water tank. The toilet body and the water tank are arrangedon the base, a cavity is formed in a pedal region on the base, and a pedal lifting component is arranged on the cavity. The pedal lifting component includes a shell placed in the cavity, the shell ishollow, the shell is internally and sequentially provided with a pedal plate which can move up and down, a middle plate and a connection plate from up to bottom, and a cushion spring is arranged between the pedal plate and the middle plate. Compared with the prior art, the structure has the advantages that an adjustable pedal type flushing device used for the toilet is provided, the height of thepedal plate can be conveniently adjusted, the structure is convenient for people different in height to use, the comfort degree is high, and the structure is very intelligent and convenient.