The invention provides a photovoltaic support and a photovoltaic cell panel cleaning machine test stand. The photovoltaic support comprises a platform lifting mechanism and a dip angle adjustment mechanism, wherein the platform lifting mechanism comprises a lifting platform at an upper part, a base platform at a lower part, a first linear driving mechanism and a guide mechanism, a movable end and a fixed end of the first linear driving mechanism are respectively connected with the lifting platform and the base platform, the guide mechanism comprises a vertical post and a guide assembly, the guide assembly is used for guiding the lifting motion of the vertical post, the vertical post and the guide assembly are respectively arranged on the lifting platform and the base platform, the dip angle adjustment mechanism comprises a framework and a second linear driving mechanism, a lower end of the framework is connected with the lifting platform in a pivoting way, and a movable end and a fixed end of the second linear driving mechanism are respectively connected with a middle upper part of the framework and the lifting platform. By the photovoltaic support, the height and the dip angle of a photovoltaic cell panel can be adjusted.