The invention relates to a dynamic linking temperature-sensitive star-type dendronized polymer and a preparation method thereof. The dynamic linking temperature-sensitive star-type dendronized polymer consists of a core part of dynamic linking and an arm part of the temperature-sensitive dendronized polymer. The preparation method comprises the following step: carrying out exchange reaction of sulfydryl and disulfide bonds on a double block polymer jointly consisting of a block with the dynamic linking characteristic and a dendronized polymer block with the temperature-sensitive characteristic and a crosslinking agent with double sulfydryl by adopting a method of arm first and core second to successfully prepare the dynamic linking temperature-sensitive star-type dendronized polymer. The polymer has excellent temperature-sensitive performance, and the core can be biodegraded/or the disulfide bonds/sulfydryl is reversible in the presence of an oxidizing agent/a reducing agent, so that the polymer shows a dynamic reversible characteristic. Therefore, the polymer has an application prospect in the fields such as drug controlled release, smart materials and the like.