The invention discloses a badminton racket with a telescopic function. The badminton racket with the telescopic function comprises a handle; a handguard is fixedly connected to the top of the handle;a lifting device is in sliding connection with the inner wall of the handle; a limiting groove is formed in the surface of the lifting device; a transmission groove is formed in the inner wall of thehandguard. The limiting groove, the transmission groove, a bearing, a connecting column, a turnplate, a connecting plate, a sliding sleeve, a sliding rod, an inclined plate, a movable plate and a limiting column are provided, a user can stretch a supporting rod upwards or downwards, the turnplate is rotated to drive the connecting plate to move downwards, the connecting plate drives the inclined plate to move downwards, the inclined plate pushes the movable plate, the movable plate drives the limiting column to enter the limiting groove, and the supporting rod is clamped tightly, so that the length of the badminton racket can be adjusted, and the problems that the length of the conventional badminton racket cannot be adjusted according to the requirement of the user and the use comfort degree of the user is reduced are solved.