The invention relates to a high-efficiency flocculation and sedimentation device convenient to clean and used for sewage treatment. The high-efficiency flocculation and sedimentation device comprisesa main body, a water inlet pipe, a water outlet pipe, a sedimentation pool, an operation plate, two supports, a stirring mechanism and two separating mechanisms, wherein the stirring mechanism comprises a motor, a rotating shaft, a transmission assembly, two auxiliary assemblies and a plurality of first stirring plates; each separating mechanism comprises a fixed box, a separating plate and a supporting plate; a driving assembly is arranged in each fixed box; and each driving assembly comprises an electromagnet, an iron block, a driving plate, two supporting rods and two springs. The high-efficiency flocculation and sedimentation device convenient to clean and used for sewage treatment has the following advantages: through the stirring mechanism, sewage and a flocculant fully contact witheach other to improve the effects of coagulation and sedimentation, so stirring is more complete; and through the separating mechanisms, the main body and the sedimentation pool can be separated, so sewage discharging is convenient.