The invention discloses a sliding rail type moving platform used for a building tower crane. The moving platform includes a moving platform body installed on a standard section; clamping devices are fixedly installed on the standard section, and each clamping device is formed by using bolts for fixedly connecting an upper clamping arm with a lower clamping arm; insertion rods are inserted in eachclamping device, guide rails are integrally formed at the tail ends of the insertion rods, guiding wheels matched with the guide rails are fixedly installed on the inner side of the moving platform body, driving motors are fixedly installed above the moving platform body, and a driving wheel is driven at the tail end of each driving motor. According to the designed slide rail type moving platform,by means of the moving platform body installed on the outer side of the standard section, workers can be conveyed up and down, correspondingly the workers do not bother to climb the tower crane by themselves, and consumption of the physical strength of the workers can also be greatly reduced. Moreover, the moving platform adopts two driving modes, the safety is high, and a high practical value isachieved.