A photovoltaic frame, characterized by comprising: a top support portion, a bottom support portion, arranged opposite to the top support portion; a first side edge portion, configured to connect the top support portion and the bottom support portion; a transverse edge portion, located at one side of the top support portion away from the bottom support portion; a second side edge portion, configured to connect the top support portion and the transverse edge portion; wherein: the top support portion, the second side edge portion and the transverse edge portion form a holding slot configured to hold a stacked structure; the top support portion has a bearing surface facing the holding slot; the second side edge portion has a first inner surface and a first outer surface which are opposite to each other, and the first inner surface being a part of an inner wall of the holding slot; the transverse edge portion has a second inner surface and a second outer surface which are opposite to each other, and the second inner surface facing the top support portion; the top support portion has a third inner surface and a third outer surface which are opposite to each other, and the third inner surface facing the transverse edge portion; the bottom support portion has an upper surface and a lower surface which are opposite to each other; and the first side edge portion has a left surface and a right surface which are opposite to each other; and a weather-resistant protective layer, only covering the second inner surface, the second outer surface, the third inner surface, the third outer surface, the upper surface and the lower surface; wherein the weather-resistant protective layer includes an alloy plating layer or an organic film layer; and the photovoltaic frame is formed from a carbon steel sheet material by a cold roll forming process. a top support portion, a bottom support portion, arranged opposite to the top support portion; a first side edge portion, configured to connect the top support portion and the bottom support portion; a transverse edge portion, located at one side of the top support portion away from the bottom support portion; a second side edge portion, configured to connect the top support portion and the transverse edge portion; wherein: the top support portion, the second side edge portion and the transverse edge portion form a holding slot configured to hold a stacked structure; the top support portion has a bearing surface facing the holding slot; the second side edge portion has a first inner surface and a first outer surface which are opposite to each other, and the first inner surface being a part of an inner wall of the holding slot; the transverse edge portion has a second inner surface and a second outer surface which are opposite to each other, and the second inner surface facing the top support portion; the top support portion has a third inner surface and a third outer surface which are opposite to each other, and the third inner surface facing the transverse edge portion; the bottom support portion has an upper surface and a lower surface which are opposite to each other; and the first side edge portion has a left surface and a right surface which are opposite to each other; and the top support portion, the second side edge portion and the transverse edge portion form a holding slot configured to hold a stacked structure; the top support portion has a bearing surface facing the holding slot; the second side edge portion has a first inner surface and a first outer surface which are opposite to each other, and the first inner surface being a part of an inner wall of the holding slot; the transverse edge portion has a second inner surface and a second outer surface which are opposite to each other, and the second inner surface facing the top support portion; the top support portion has a third inner surface and a third outer surface which are opposite to each other, and the third inner surface facing the transverse edge portion; the bottom support portion has an upper surface and a lower surface which are opposite to each other; and the first side edge portion has a left surface and a right surface which are opposite to each other; and a weather-resistant protective layer, only covering the second inner surface, the second outer surface, the third inner surface, the third outer surface, the upper surface and the lower surface; wherein the weather-resistant protective layer includes an alloy plating layer or an organic film layer; and the photovoltaic frame is formed from a carbon steel sheet material by a cold roll forming process.