A photovoltaic module comprising: a base plate (110, 210, 310, 610, 710, 810), a cell string (100, 200, 300, 600, 700, 800) and a cover plate (120, 220, 320, 620, 720, 820) stacked in order; a first packaging layer (130, 230, 330, 630, 730, 830), located between the base plate (110, 210, 310, 610, 710, 810) and the cover plate (120, 220, 320, 620, 720, 820) and surrounding the cell string (100, 200, 300, 600, 700, 800), the first packaging layer (130, 230, 330, 630, 730, 830), the base plate (110, 210, 310, 610, 710, 810) and the cover plate (120, 220, 320, 620, 720, 820) defining a first sealed space; and a moisture treatment layer, located in the first sealed space, wherein the moisture treatment layer comprises at least one of a functional layer (140, 240, 340, 880) and a moisture detection layer (380, 640, 740, 840); the functional layer (140, 240, 340, 880) being adaptive to absorb moisture and be converted into a solidified layer, and the solidified layer having a degree of crosslinking greater than a degree of cross linking of the functional layer (140, 240, 340, 880); and the moisture detection layer (380, 640, 740, 840) being adaptive to detect and determine whether there is moisture in the first sealed space through response information of the moisture detection layer (380, 640, 740, 840); wherein the cell string (100, 200, 300, 600, 700, 800) has a first surface (101, 206, 601, 706) and a second surface (102, 209, 602, 709) opposite each other, and a side surface (103, 603) connecting the first surface (101, 206, 601, 706) and the second surface (102, 209, 602, 709), the first surface (101, 206, 601, 706) is away from the base plate (110, 210, 310, 610, 710, 810), and the second surface (102, 209, 602, 709) faces the base plate (110, 210, 310, 610, 710, 810); and the first surface (101, 206, 601, 706) comprises a central region (105, 208, 605, 708) and a peripheral region (104, 207, 604, 707) surrounding the central region (105, 208, 605, 708), and the moisture treatment layer is located on the side surface (103, 603) and on the first surface of the peripheral region (104, 207, 604, 707); the photovoltaic module further comprises: a separation layer (160, 260, 660, 760) located on the side surface (103, 603) and the first surface of the peripheral region (104, 207, 604, 707), the separation layer (160, 260, 660, 760) located between the moisture treatment layer and the cell string (100, 200, 300, 600, 700, 800). a base plate (110, 210, 310, 610, 710, 810), a cell string (100, 200, 300, 600, 700, 800) and a cover plate (120, 220, 320, 620, 720, 820) stacked in order; a first packaging layer (130, 230, 330, 630, 730, 830), located between the base plate (110, 210, 310, 610, 710, 810) and the cover plate (120, 220, 320, 620, 720, 820) and surrounding the cell string (100, 200, 300, 600, 700, 800), the first packaging layer (130, 230, 330, 630, 730, 830), the base plate (110, 210, 310, 610, 710, 810) and the cover plate (120, 220, 320, 620, 720, 820) defining a first sealed space; and a moisture treatment layer, located in the first sealed space, wherein the moisture treatment layer comprises at least one of a functional layer (140, 240, 340, 880) and a moisture detection layer (380, 640, 740, 840); the functional layer (140, 240, 340, 880) being adaptive to absorb moisture and be converted into a solidified layer, and the solidified layer having a degree of crosslinking greater than a degree of cross linking of the functional layer (140, 240, 340, 880); and the moisture detection layer (380, 640, 740, 840) being adaptive to detect and determine whether there is moisture in the first sealed space through response information of the moisture detection layer (380, 640, 740, 840); wherein the cell string (100, 200, 300, 600, 700, 800) has a first surface (101, 206, 601, 706) and a second surface (102, 209, 602, 709) opposite each other, and a side surface (103, 603) connecting the first surface (101, 206, 601, 706) and the second surface (102, 209, 602, 709), the first surface (101, 206, 601, 706) is away from the base plate (110, 210, 310, 610, 710, 810), and the second surface (102, 209, 602, 709) faces the base plate (110, 210, 310, 610, 710, 810); and the first surface (101, 206, 601, 706) comprises a central region (105, 208, 605, 708) and a peripheral region (104, 207, 604, 707) surrounding the central region (105, 208, 605, 708), and the moisture treatment layer is located on the side surface (103, 603) and on the first surface of the peripheral region (104, 207, 604, 707); the photovoltaic module further comprises: a separation layer (160, 260, 660, 760) located on the side surface (103, 603) and the first surface of the peripheral region (104, 207, 604, 707), the separation layer (160, 260, 660, 760) located between the moisture treatment layer and the cell string (100, 200, 300, 600, 700, 800).