A hair styling device, comprising: a base (31, 51, 61, 71, 91); and a plurality of pins (301-304, 501-506, 601-609, 701-707) having respective first ends connected to a first side of the base (31, 51, 61, 71, 91), and spaced from each other, characterized in that: the base (31, 51, 61, 71, 91) and the plurality of pins (301-304, 501-506, 601-609, 701-707) are produced from a single-layer flexible workpiece, in which the base (31, 51, 61, 71, 91) is located at one end of the workpiece, at least two of the plurality of pins (301 and 304, 502 and 505, 603 and 607, 702 and 706) are connected to each other at respective second ends (3010 and 3040, 5020 and 5050, 6030 and 6070, 7020 and 7060) opposite to the first ends, thereby forming a first branch of pins (310, 510, 610, 710, 910) exhibiting a bistable mechanism that is capable of switching between concave-convex positions in response to an external force, at least another two of the plurality of pins (302, 303, 501, 503, 504, 506, 601, 602, 604, 605, 606, 608, 609, 701, 702, 703, 704, 705, 707) are remained to have free second ends (3020, 3030, 5010, 5030, 5040, 5060, 6010, 6020, 6040, 6050, 6060, 6080, 6090, 7010, 7020, 7030, 7040, 7050, 7070) opposite to the first ends, thereby forming a second branch (320, 520, 620, 720, 920) layered from the first branch (310, 510, 610, 710, 910), and the first branch (310, 510, 610, 710, 910) is switched to a concave position relative to the second branch (320, 520, 620, 720, 920) to create a space for receiving or releasing hair, and switched to a convex position relative to the second branch (320, 520, 620, 720, 920) to close the space for securing hair. a base (31, 51, 61, 71, 91); and a plurality of pins (301-304, 501-506, 601-609, 701-707) having respective first ends connected to a first side of the base (31, 51, 61, 71, 91), and spaced from each other, characterized in that: the base (31, 51, 61, 71, 91) and the plurality of pins (301-304, 501-506, 601-609, 701-707) are produced from a single-layer flexible workpiece, in which the base (31, 51, 61, 71, 91) is located at one end of the workpiece, at least two of the plurality of pins (301 and 304, 502 and 505, 603 and 607, 702 and 706) are connected to each other at respective second ends (3010 and 3040, 5020 and 5050, 6030 and 6070, 7020 and 7060) opposite to the first ends, thereby forming a first branch of pins (310, 510, 610, 710, 910) exhibiting a bistable mechanism that is capable of switching between concave-convex positions in response to an external force, at least another two of the plurality of pins (302, 303, 501, 503, 504, 506, 601, 602, 604, 605, 606, 608, 609, 701, 702, 703, 704, 705, 707) are remained to have free second ends (3020, 3030, 5010, 5030, 5040, 5060, 6010, 6020, 6040, 6050, 6060, 6080, 6090, 7010, 7020, 7030, 7040, 7050, 7070) opposite to the first ends, thereby forming a second branch (320, 520, 620, 720, 920) layered from the first branch (310, 510, 610, 710, 910), and the first branch (310, 510, 610, 710, 910) is switched to a concave position relative to the second branch (320, 520, 620, 720, 920) to create a space for receiving or releasing hair, and switched to a convex position relative to the second branch (320, 520, 620, 720, 920) to close the space for securing hair. the base (31, 51, 61, 71, 91) and the plurality of pins (301-304, 501-506, 601-609, 701-707) are produced from a single-layer flexible workpiece, in which the base (31, 51, 61, 71, 91) is located at one end of the workpiece, at least two of the plurality of pins (301 and 304, 502 and 505, 603 and 607, 702 and 706) are connected to each other at respective second ends (3010 and 3040, 5020 and 5050, 6030 and 6070, 7020 and 7060) opposite to the first ends, thereby forming a first branch of pins (310, 510, 610, 710, 910) exhibiting a bistable mechanism that is capable of switching between concave-convex positions in response to an external force, at least another two of the plurality of pins (302, 303, 501, 503, 504, 506, 601, 602, 604, 605, 606, 608, 609, 701, 702, 703, 704, 705, 707) are remained to have free second ends (3020, 3030, 5010, 5030, 5040, 5060, 6010, 6020, 6040, 6050, 6060, 6080, 6090, 7010, 7020, 7030, 7040, 7050, 7070) opposite to the first ends, thereby forming a second branch (320, 520, 620, 720, 920) layered from the first branch (310, 510, 610, 710, 910), and the first branch (310, 510, 610, 710, 910) is switched to a concave position relative to the second branch (320, 520, 620, 720, 920) to create a space for receiving or releasing hair, and switched to a convex position relative to the second branch (320, 520, 620, 720, 920) to close the space for securing hair.