The invention relates to a street lamp based on the Internet of things and having a bulb automatic replacement function. The street lamp comprises a lamp post, a lampshade and a lampholder, and further comprises a replacement mechanism and a center control mechanism. The replacement mechanism comprises a drive assembly, a fixed shaft, a fourth gear, a turnplate, a base, a substrate, a power assembly, at least two illuminating lamps and at least two replacement assemblies. Each replacement assembly comprises an adsorption unit, a first baffle, a limit block, a rotating rod, a first sleeve and two first springs. The power assembly comprises a first drive unit, a second drive unit, a second sleeve, a connecting block, a second gear, a moving rod, a second baffle, a third baffle and two secondsprings. In the street lamp based on the Internet of things and having the bulb automatic replacement function, when a bulb of the street lamp is damaged, a worker can replace the bulb without climbing to the street lamp, the period of the bulb, replaced by the worker, of the street lamp is extended, manpower consumption is reduced, and the practicability of the street lamp is improved.