A tonneau cover lift; the tonneau cover lift includes a height-adjustable, lightweight tonneau cover assembly including a cover member and a rectangular frame supported by four telescoping, hydraulic support posts including a first-telescopic-leg, a second-telescopic-leg, a third-telescopic-leg, and a fourth-telescopic-leg. The cover member is sized and configured to cover a bed of a truck and may be remotely controlled using a remote activation unit. The tonneau cover lift expands a protected cargo capacity of a truck.