A piezoelectric friction damper is an intelligent damper used for vibration control of a civil structure, a mechanical structure or an aviatic structure to provide variable damping force. A left limit baffle (7) and a right limit baffle (8) are respectively connected to two ends of a working cylinder (1) of the piezoelectric friction intelligent damper; two string shape pistons (3) are arranged in the working cylinder (1) of the piezoelectric friction intelligent damper; high frictional damping material (6) is stuck on the surface where the two string shape pistons (3) contact the inner wall of the working cylinder; a plurality of paths of connection are arranged between the two string shape pistons (3) along the height; each path of connection comprises two set-up springs applying pre-pressure and a piezoelectric bar (4) connected by two connecting member bars (5) made of insulation materials; the piezoelectric friction intelligent damper is connected with outer structures through connecting member bars (11) which is connected with a connecting steel plate (10). The intelligent damper has high capacity of energy consumption and can provide variable damping force.