An embodiment of the present invention provides a platelet extracting device for effectively extracting platelets divided through a centrifugation process. Here, the platelet extracting device includes a body part, a piston part, an outer wall part, and an opening part. The body part includes: a pipe having an internal space； a first separation plate installed in the pipe to divide the internal space, comprising a first through hole for moving a specimen, and forming a lower chamber in the lower part of the pipe to store a red corpuscle layer of the specimen； and a second separation plate installed in the upper part of the first separation plate to divide the internal space, comprising a second through hole for moving the specimen, and forming an upper chamber in the upper part of the pipe to store a blood plasma layer of the specimen while forming a central chamber between the first separation plate and the second separation plate to store a platelet layer of the specimen. The piston part is elevated with the outer surface attached to the inner surface of the pipe to move the specimen upwards. The outer wall part is installed to surround the outer part of the pipe to have an operating space between the outer surface of the pipe and the outer wall part. The opening part includes: a first rotary plate attached to the first separation plate and including a third through hole corresponding to the first through hole； a second rotary plate attached to the second separation plate and including a fourth through hole corresponding to the second through hole； and handle installed in the operating space, connected to the first and second rotary plates, and rotated in a circumferential direction while rotating the first and second rotary plates to open or close the first and second separation plates at the same time.본 발명의 일실시예는 원심분리 공정을 거쳐 나뉘어진 혈중 혈소판을 효과적으로 추출하기 위한 혈소판 추출장치를 제공한다. 여기서, 혈소판 추출장치는 본체부, 피스톤부, 외벽부 그리고 개폐부를 포함한다. 본체부는 내측에 내부공간을 가지는 관체와, 관체의 내부에 구비되어 내부공간을 구획하며, 시료
