A heat dissipation device includes a receiving body and a blower. The receiving body includes a recessed body. The recessed body includes a first sidewall, a second sidewall opposite to the first sidewall, and a bottom connecting the first sidewall to the second sidewall. The blower is arranged on the bottom. The blower includes a casing, an air supply pipeline communicating with the casing, and an air blocking plate between the casing and the air supply pipeline. Two opposite ends of the air blocking plate respectively contact with the first sidewall and the second sidewall, such that the recessed body is separated into a first recessed area and a second recessed area. The first recessed area receives the casing, and the second recessed area receives the air supply pipeline.