The invention pertains to the field of friction dampers, specifically focusing on a variable parameter friction damper. It comprises a rotation energy dissipation unit, comprising a first rotation arm, a second rotation arm, a friction plate, and a pressure regulating component. The first rotation arm has a first rotation part and a second rotation part, while the second rotation arm has a third rotation part and a fourth rotation part. The first and third rotation parts rotate around a first axis, with the friction plate positioned between them. The pressure regulating component adjusts the distance between the first and third rotation parts. The second and fourth rotation parts are hinged on the building matrix. This damper can adaptively adjust bearing capacity and energy dissipation based on external excitation levels and disaster types, showcasing strong adaptability to varying deformation levels.