Abstract: The invention discloses a connecting device of street lamp pole. The connecting device comprises a first connecting piece and a second connecting piece; the first connecting piece and the second connecting piece are arranged in an independent split mode; one end of the first connecting piece is used for connecting a street lamp holder, and the other end is provided with a mortise; one end of the second connecting piece is used for connecting the lamp pole, and the other end is provided with a tenon capable of being inserted into the mortise; and the mortise is provided with a first combining hole, the tenon is provided with a second combining hole, and when the tenon is inserted into the mortise, the first connecting piece and the second connecting piece are fixed by inserting a bolt into the first combining hole and the second combining hole. According to the invention, the street lamp and connecting device are convenient for mounting, disassembly and maintenance.