The invention discloses an artificial wetland device for avoiding blockage, which comprises a fixing block fixedly installed on a ground surface; the top side of the fixing block is provided with a water storage tank; gliding slots are arranged on inner walls at four sides of the water storage tank, and gliding blocks are glidingly installed in the gliding slots; one side of each gliding block extends out of each gliding slot and is fixedly equipped with a filler plate; the top side of the filler plate extends out of the water storage tank, and is fixedly equipped with a cross plate; fixing slots of which top sides are opened are arranged on inner walls at four sides of the opening at the top side of the water storage tank, and a cross plate is moveably installed in a fixing slot; the fixing slot is provided with a fixing mechanism for stably mounting the cross plate, and a through hole is arranged on the inner wall at one side of the water storage tank. The artificial wetland device has the advantages of conveniently and stably mounting and dismounting the cross plate, dismounting the filler plate conveniently while preventing sundries in the water storage tank from stacking and causing blockage, facilitating shaking of a water outlet pipe, and preventing blockage caused by stacking sundries at the inner wall of the water outlet pipe.