The invention discloses a device for improving the framing accuracy of a photovoltaic module. The device comprises a base and a coaming plate vertically fixed at the upper end of the base. The lower end of the base is fixedly provided with two parallelly-arranged rectangular long-strip pipes. The two outer sides of the coaming plate are vertically provided with two rows of clamping mechanisms which are evenly distributed in a linear mode. The two inner sides of the coaming plate are provided with rolling mechanisms which are evenly distributed in the vertical direction. The invention further provides a using method of the device. The device is reasonable in design and simple and convenient to use, the photovoltaic module can be effectively supported, the device can be adapted to clamping and fixing of various sizes and can effectively clamp and guide the photovoltaic module to be framed, and the framing precision is improved; and meanwhile, the framing operation is very simple, the batch operation can be conducted, the work efficiency is effectively improved, framing is achieved without a traditional counter, the occupied area is small, the production cost is saved, moving is simple, the labor intensity is reduced, semi-finished products and finished products are effectively distinguished to avoid confusion, and good using and economic values are achieved.