Adjustable seat

An adjustable seat is used for solving the problems that in the prior art, a seat in the prior art needs to move a backrest by screwing a bolt, and in the actual use process, the tightening force between the bolt and the backrest is too large, so that a user needs to adjust the backrest through tools such as a screwdriver, and the use is inconvenient. The technical problem that a user cannot have good use experience during sitting due to the fact that the backrest cannot be conveniently adjusted according to self requirements in the prior art is solved, the seat comprises a seat plate, a cushion is arranged on the seat plate, a vertical supporting rod is fixedly arranged on the seat plate, a row of inserting grooves distributed in the vertical direction are formed in the supporting rod, and the inserting grooves are arranged in the inserting grooves. Two moving blocks are arranged on the supporting rod in a sliding mode, a backrest and a waist rest which face the cushion are arranged on the two moving blocks