The present invention relates to a hole type float having a buoyancy control function, and more specifically, to a hole type float having a buoyancy control function wherein an upper cap elastically supported by an upper portion of a float body is rotated to change the buoyancy inside the hole type float according to the step, and an upper float and a lower float, which are received inside the upper cap, are automatically dropped through the rotation of the upper cap, thereby controlling the sinking rate of the hole type float. The hole type float having a buoyancy control function according to the present invention comprises a float body (10) and an upper cap (11). The float body (10): includes an internal space (100) with an opened upper portion； a hollow type first guide bar (101) formed in the center of the internal space (100)； and a fixing part (13) positioned on an upper end of the first guide bar (101). The upper cap (11) is coupled to an upper portion of the float body (10), and elastically supported by an internal spring (19) to press an upper portion and rotate the upper portion at a predetermined angle, thereby changing the internal buoyancy according to the step. The upper cap (11) includes: a spring (19) provided around the center of an internal space (110) with an opened lower portion； a hollow type second guide bar (111) communicating with the first guide bar (101)； and a buoyancy change part (14), which is fixed to the circumference of an internal surface of a lower portion, and changes the internal buoyancy according to the step while one side of an upper surface of the buoyancy change part (14) is selectively bound with one side of a position fixing part (13).본 발명은 부력 조절 기능을 갖는 구멍찌에 관한 것으로서, 더욱 상세하게는 찌몸체 상부에 탄성 지지되는 상부캡을 회전시켜 구멍찌 내부의 부력을 단계별로 변화시키고, 상부캡의 회전을 통해 내부에 수납된 상부추와 하부추를 자동으로 낙하시킬 수 있어 구멍찌의 침하속도를 조절할 수 있는 부력 조절 기능을 갖는 구멍찌에 관한 것이다.본 발명에 따른 부력조절 기능을 갖는 구멍찌는 상부가 개방된 내부공간(100)이 형성되며 상기 내부공간(100) 중심에 중공의 제1가이드대(101)가 형성되고 상기 제1가이드대(101)의 상단에
