The invention discloses a constant force spring hanger in the technical field of elastic telescopic machinery, which comprises a casing and a load tie rod, wherein the casing is hollow and the load tie rod is disposed inside the casing. The lower end of the load tie rod penetrates from the bottom cover of the casing out, and a draw plate is fixed at the upper end of the tie rod. A plurality of disc spring assemblies are arranged between the draw plate and the bottom cover of the casing, each disc spring assembly is overlaid by one disc spring or a plurality of the disc springs, two adjacent disc spring assemblies are arranged opposite to each other, ratio of the inner cone height of the disc spring and thickness thereof is 105-2.0, and a limiting stopper capable of preventing the disc spring from flanging is disposed between two disc spring assemblies which are in involution arrangement. The constant force spring hanger employs the characteristic of zero stiffness of the disc springs to fabricate the constant force spring hanger with advantages of simple structure, easy mounting, low fabrication cost and reliable utilization, and can be applied to various situations requiring suspension and support.