The present invention discloses an inclinable power cable rack support device. The device comprises: a pedestal mechanism, wherein the pedestal mechanism comprises a rectangular base plate and vertical plates arranged at left and right sides of the base plate; a fixed mechanism comprising two fixed rods vertically arranged at the upper portions of the vertical plates front and back, wherein the outer side ends of the fixed rods and two ends of the vertical rods are respectively provided with tilt levers with equal lengths; a driving mechanism comprising cylinders respectively arranged at the upper ends of the fixed rods; and a bearing mechanism comprising two bearing bodies arranged front and back, wherein each bearing body comprises one U-shaped rack with the direction being consistent tothe extension direction of each vertical plate, and each U-shaped rack comprises one horizontal portion and two vertical portions arranged at two sides of the horizontal portion, the center positionof each vertical portion is provided with one circular-arc groove, one roller is arranged between two ends of each two vertical portions, and the rollers are rotationally connected with the vertical portions. The inclinable power cable rack support device is simple in structure and convenient to carry, saves time and labor, and reduces labor intensity.