The present invention relates to a movable and buoyancy-adjustable fishing sinker. Specifically, the movable and buoyancy-adjustable fishing sinker used when fishing comprises: a first upper cap formed in a hollow cylindrical shape, wherein a lower surface thereof is opened, and a first through hole is formed on one side of an upper surface thereof； a support bar which is a pipe member having a second through hole formed on the inside thereof, and whose one end is installed in the first through hole disposed on an inner surface of the first upper cap； a body unit provided with a body in a cylindrical shape, a third through hole penetrating an upper and a lower surface of the body, and a first mounting groove slotted on one side of an outer circumferential surface of the body in an annular shape, and installed on one side of the support bar by the other end of the support bar penetrating the third through hole； and a first watertight member formed in an annular shape and installed in the first mounting groove to make an upper portion of the body unit tightly adhere to the inside of the first upper cap when the upper portion of the body unit is inserted into an inner space of the lower surface of the first upper cap. The first, the second, and the third through hole are disposed in a straight line. A fishing line penetrates the through holes, and then the support bar moves on one side of the fishing line and is fixed. Even if a fishing person changes a fishing arrangement or a fishing technique when fishing, the fishing person can adjust buoyancy of the fishing sinker without adding or removing a sinker to improve convenience of the fishing person.본원발명은 유동식 부력조절 낚시추에 관한 것으로 상세하게는 낚시시 사용되는 낚시추에 있어서, 속이 빈 기둥 형상으로 하면이 오픈되어 있고 상면 일측에 제1관통공이 뚫려 있는 제1상부캡과, 내측에 제2관통공이 뚫려 있는 관 부재로 일단이 상기 제1상부캡의 내면에 있는 상기 제1관통공에 설치되는 지지봉과, 기둥 형상의 몸체와 상기 몸체의 상,하면을 관통하는 제3관통공과 상기 몸체의 외주면 일측에 링 형상의 홈이 파져 있는 제1결합홈으로 구성되되, 상기 지지봉의 타단이 상기 제3관통공을 관통하여 상기 지지봉의 일측에 설치되는 몸체부와, 링 형상으로 상기 몸체부의 상부가 상기 제1상부
