<p>A power supply device for a construction lift is disclosed. The power supply device for a construction lift according to an embodiment of the present invention supplies power to a transport unit which moves vertically along a mast and comprises: an insulative power duct wherein a plurality of power supply rail recesses to accommodate a plurality of electrodes are formed in a bar shape and arranged in the vertical movement direction of the transport unit, and a sliding guide recess with an open end is installed in parallel with the mast to penetrate therethrough in a longitudinal direction while being connected to the plurality of power supply rail recesses; and a collector which is connected to the transport unit and moves up and down with the the transport unit while sliding on the guide recess and being connected to a plurality of brushes slidably mounted in the power supply rail recesses, wherein the brushes are in contact with the electrodes.</p>
