Adjustable seat

The utility model relates to the technical field of seats, in particular to an adjustable seat which comprises a seat plate, armrests are fixedly mounted at the left end and the right end of the seat plate respectively, supporting legs are fixedly mounted at four corners of the lower end of the seat plate respectively, a supporting plate and two fixing plates are fixedly mounted at the rear ends of the two supporting legs at the rear portion respectively, and a transmission mechanism is arranged at the upper end of the supporting plate. A backrest body is movably installed on the rear portion of the seat plate and is in threaded connection with the transmission mechanism, and a supporting body is slidably installed at the front end of the backrest body. According to the adjustable chair disclosed by the utility model, the waist of an office worker is effectively supported through the back cushion, the pressure of lumbar vertebrae and waist muscles is balanced, the strain is reduced, the comfort level is incre