The invention discloses a heat dissipation device for photovoltaic power generation in a desert and belongs to the technical field of photovoltaic panel heat dissipation. The heat dissipation device disclosed by the invention comprises an outer frame which is divided into four placing slot positions by a 'cross'-shaped separating plate, and a photovoltaic panel is arranged inside each placing slotposition, a locating nut is arranged on the back of each photovoltaic panel, a fixed frame is arranged on opposite frames of the outer frame respectively, a pair of connecting plates are arranged oneach fixed frame, and pore plates are respectively arranged at the two ends of each connecting plate; a plurality of first heat dissipation strips are arranged on the back side of each photovoltaic panel, the end part of each first heat dissipation strip is in fit with the 'cross'-shaped separating plate, one end of the 'cross'-shaped separating plate is connected with a heat conducting bar, the other end of the heat conducting bar is at least provided with a pair of 'trifurcate' heat distribution bars, two heat conducting bars are respectively connected with the two ends of a heat exchange tube, and a circulating air pump is arranged on one of the two heat conducting bars. The heat dissipation device disclosed by the invention performs heat dissipation on photovoltaic panels mounted in the desert, and service life of each photovoltaic panel is prolonged.