Provided is a secondary trimming device for a photovoltaic assembly. The secondary trimming device mainly includes first clamping drive apparatuses, second clamping drive apparatuses, and a fixing base. A blade is disposed on one side of one first clamping drive apparatus facing a photovoltaic assembly. The first clamping drive apparatus can drive the blade to get close to the photovoltaic assembly. One second clamping drive apparatus is connected to one end of the first clamping drive apparatus facing away from the photovoltaic assembly and can drive the first clamping drive apparatus to rotate. The first clamping drive apparatuses and the second clamping drive apparatuses are each disposed on the fixing base.