A device for extracting platelet rich plasma, the device comprising: a main body unit comprising an upper accommodation space having a lower end part having an inclined surface having a width gradually decreasing in a downward direction, a lower accommodation space disposed below the upper accommodation space and having an upper end part having a width gradually decreasing in an upward direction, and a bottleneck part that is a passage connecting the upper accommodation space and the lower accommodation space; an upper cover disposed above the main body unit and retractably coupled to the main body unit; and a lower cover disposed below the main body unit and retractably coupled to the main body unit to seal the lower accommodation space, wherein a syringe guide having a hollow tube structure, which extends downward from a protruding-type syringe insertion hole for inserting a syringe, and disposed inside the upper accommodation space is defined at a central portion of a top surface of the upper cover, wherein, a syringe nozzle coupling hole having a protruding structure for being coupled with a syringe nozzle is defined at a position spaced apart from the syringe insertion hole, and a PRP extraction tube having a through hole structure, which extends downward from the syringe nozzle coupling hole in the upper accommodation space and having a lower inclinedly cut cross-section, is disposed in the upper accommodation space, wherein, when the upper cover descends, a lower end of the syringe guide blocks the bottleneck part and a space above the bottleneck part, and, at the same time, as the end of the PRP extraction tube is pressed and inclined by contacting the inclined surface, while one surface of the PRP extraction tube contacts the syringe guide, an upper end part of the lower inclinedly cut cross-section of the PRP extraction tube having an inclined surface structure contacts the inclined surface (1 1a) of the upper accommodation space, and as a lower end part is slightly spaced apart from the inclined surface of the upper accommodation space, a gap through which solution inside the upper accommodation space flows into the PRP extraction tube is generated. a main body unit comprising an upper accommodation space having a lower end part having an inclined surface having a width gradually decreasing in a downward direction, a lower accommodation space disposed below the upper accommodation space and having an upper end part having a width gradually decreasing in an upward direction, and a bottleneck part that is a passage connecting the upper accommodation space and the lower accommodation space; an upper cover disposed above the main body unit and retractably coupled to the main body unit; and a lower cover disposed below the main body unit and retractably coupled to the main body unit to seal the lower accommodation space, wherein a syringe guide having a hollow tube structure, which extends downward from a protruding-type syringe insertion hole for inserting a syringe, and disposed inside the upper accommodation space is defined at a central portion of a top surface of the upper cover, wherein, a syringe nozzle coupling hole having a protruding structure for being coupled with a syringe nozzle is defined at a position spaced apart from the syringe insertion hole, and a PRP extraction tube having a through hole structure, which extends downward from the syringe nozzle coupling hole in the upper accommodation space and having a lower inclinedly cut cross-section, is disposed in the upper accommodation space, wherein, when the upper cover descends, a lower end of the syringe guide blocks the bottleneck part and a space above the bottleneck part, and, at the same time, as the end of the PRP extraction tube is pressed and inclined by contacting the inclined surface, while one surface of the PRP extraction tube contacts the syringe guide, an upper end part of the lower inclinedly cut cross-section of the PRP extraction tube having an inclined surface structure contacts the inclined surface (1 1a) of the upper accommodation space, and as a lower end part is slightly spaced apart from the inclined surface of the upper accommodation space, a gap through which solution inside the upper accommodation space flows into the PRP extraction tube is generated.