The invention relates to tweezers which comprise two elastic arms, two tweezer heads and two fixing caps, wherein one ends of the two elastic arms are fixed together, and the other ends are mutually separated to respectively form a free end; the two tweezer heads are respectively installed on the free ends of the two elastic arms by the two fixing caps; the middle part of each fixing cap is provided with a through hole; the inner wall of the through hole is provided with threads; the elastic arm and tweezer head are respectively provided with a fixed rod which extends outwards; the fixed rod is provided with a screw rod section and a thread section; each elastic arm and the fixed rod of the corresponding tweezer head abut against each other and are contained in the through hole of one fixing cap; each elastic arm and the thread section of the fixed rod of the corresponding tweezer head enclose a thread cylinder; the screw rod sections enclose a screw rod cylinder; and the fixing cap is screwed to the thread cylinder from the screw rod cylinder. The tweezer heads can be detachably installed on the elastic arms; and when the tweezer heads are damaged, the user only needs to replace the tweezer heads, so that the tweezers can be repeatedly utilized, thereby saving the resources.