The invention discloses a liftable ceiling illuminating lamp which comprises a top fixed box, a fixed pulley, a movable pulley, a drive mechanism, a telescopic pipe and a lamp base. The top fixed boxis fixed to the top part of a wall body; an opening communicating with the upper end of the telescopic pipe is formed in the lower part; the upper end of the telescopic pipe is connected onto the opening; the lower end of the telescopic pipe is fixedly connected with the lamp base; the inner part of the telescopic pipe is hollow; a power line penetrates through the telescopic pipe so as to be connected with the lamp base and an external power supply connector on the top part; the fixed pulley is fixed into the top fixed box and is driven by the drive mechanism so as to rotate; the movable pulley is arranged at a lower-end pipe port of the telescopic pipe; a wheel axle of the movable pulley is connected with the inner wall of the telescopic pipe through a connecting rod; and the fixed pulley and the movable pulley are connected through a connecting rope. The liftable ceiling illuminating lamp is simple in overall structure, convenient to install, manufacture, operate and use, capable ofeffectively realizing free lifting, high in flexibility, convenient to use, high in user experience degree, and high in practicability.