The invention discloses an apparatus capable of effectively removing heavy metal in water body. The apparatus comprises a body, the body comprises a feed hopper, a stirring device and a separating apparatus, the stirring device comprises a mixer casing, a stirring member, a sieve plate, a flow-disturbing member and a second motor, the separating apparatus comprises a separating tank and a heavy residue tank, the material after the heavy metal is removed is placed into the hopper, the structure system arrangement is concise and compact, the material is placed into the stirring device, sewage is mixed with strong force, the impurity with small particles is discharged through the sieve plate, the impurity with large particles is discharged from the heavy residue tank, and the processed water is discharged from the separating tank, mixing and removal effects are good, and continuous operation is realized.