The invention discloses an Internet-of-Things street lamp monitoring device with a convenient heat dissipation function. The device comprises a street lamp main body, a heat dissipation device is fixedly connected to the outer wall of the bottom end of the street lamp main body, a telescopic device is movably connected to the top of the street lamp main body, the outer wall of one end of the telescopic device is electrically connected with a monitoring device; and the outer wall of the top end of a bent connecting piece is fixedly connected with an energy-saving solar panel, an alarm loudspeaker is fixedly connected to the outer wall of the other end of the monitoring device, and a telescopic rotating rod is movably connected in the telescopic device. The flexibility of the street lamp main body is well improved through the telescopic rotating rod, the energy-saving solar panel well reflects the emergency and energy-saving performance of the street lamp main body, the alarm loudspeakercan play a role in deterring lawbreakers, so that the theft-preventing performance of the street lamp main body is well improved; and a light supplementing lamp can play a role in auxiliary lighting,so that the functional diversity of the street lamp main body is well embodied; and the device is suitable for the use of security and protection monitoring and has a wide development prospect in thefuture.