A heat dissipation unit connection reinforcement structure includes a case, at least one reinforcement structure and at least one heat pipe. The case has a case chamber and at least one opening formed through a top side of the case in communication with the case chamber. The reinforcement structure has a reinforcement main body correspondingly disposed on the opening. The reinforcement main body has a connection hole in communication with the case chamber, mating section and a reinforcement connection section. The heat pipe has a heat pipe chamber. One end of the heat pipe is inserted in the corresponding connection hole, whereby the heat pipe chamber is in communication with the case chamber. The inner circumference of the reinforcement connection section is tightly attached to and connected with an outer side of the corresponding heat pipe.