A power generation angle adjustment principle based self-power-generating energy-saving lifting street lamp comprises a base. A lamp post is fixedly connected to the upper side of the base and provided with a groove with an upward opening, a threaded rod is arranged in the groove, and the bottom of the threaded rod is in rotational connection with the bottom of the lamp post. A driving bevel gearis meshed with the left side of a driven bevel gear which is fixedly connected with the lower portion of the threaded rod, a first rotating shaft is fixedly connected with the left side of the drivingbevel gear, and the left end of the first rotating shaft is fixedly connected with a first motor output shaft. A lifting column is arranged above the threaded rod and provided with a threaded groovewith a downward opening, and the top of the threaded rod is in threaded connection with the threaded groove. The street lamp has advantages that the first rotating shaft drives the driving bevel gearto rotate, the driving bear gear drives the driven bevel gear to rotate, the driven bevel gear drives the threaded rod to rotate, and the lifting column matched with the threaded rod moves downwards to realize descending of a lamp holder.