Novel outdoor advertising lamp box

The utility model relates to the field of lamp boxes, in particular to a novel outdoor advertising lamp box which comprises a fixed installation frame, a middle transverse frame fixedly installed in the middle of the fixed installation frame, an outer screen arranged above the middle transverse frame, a lower box body arranged below the middle transverse frame, transverse frame ventilation openings formed in the middle transverse frame, and the transverse frame ventilation openings are communicated with the outer screen and the inner space of the lower box body. A cooling fan is arranged at the ventilation opening of the transverse frame; side frames on the two sides of the fixed mounting frame are externally connected with side shells, hollow side air channels are formed between the side frames and the side shells, a top frame on the upper portion of the fixed mounting frame is externally connected with a top shell, a hollow top air channel is formed between the top frame and the top shell, and a top heat di