Sediment sampler

The invention relates to a sediment sampler, which comprises a connection rod, a sampling tube, a gravity hammer, a force fixation joint and a piston assembly, wherein the sampling tube is a transparent tube, one end of the sampling tube is fixedly connected with the force fixation joint, the gravity hammer and the force fixation joint can be slidably sleeved on the outer portion of the connection rod, one end of the connection rod sequentially penetrates through the gravity hammer and the force fixation joint and then extends into the sampling tube, and is fixedly connected with the piston assembly arranged inside the sampling tube, and the piston assembly can slide along the wall of the sampling tube and maintains the air tightness inside and outside of the piston assembly. According to the present invention, the sampler has characteristics of simple structure, low processing price, durability, easy carrying, high use efficiency and good sampling effect, and can be used for sediment sampling with various water body depth ranges in the fields of geology, environmental protection, water conservancy, lakes and the like.