An air treatment device, comprising: a purification air duct, an air outlet frame of said purification duct, wherein the air outlet frame of a purification air duct is provided with a ventilation hole and a cooperation hole; a water tank drawer, wherein the water tank drawer is arranged on the air outlet frame of the purification air duct in a push-pull manner, and a safety locking member, wherein the safety locking member comprises a rotating shaft and a locking member, the rotating shaft is rotatably arranged in the cooperation hole between a locking position and an avoidance position, the locking member is arranged at the top of the rotating shaft, characterized in that the air treatment device further comprises two spaced-apart fitting protrusions are arranged on a bottom wall of the water tank drawer, the locking member is located on the front sides of the cooperation protrusions at the locking position to prevent displacement of the cooperation protrusions, and the locking member is located between the two cooperation protrusions at the avoidance position, wherein the air outlet frame of the purification air duct is provided with a cooperation groove, the cooperation hole is formed in a bottom wall of the cooperation groove, and the rotating shaft is arranged in the cooperation groove and is rotatably fitted to the cooperation hole, and wherein the safety locking member comprises a cooperation cover, the cooperation cover is rotatably located in the cooperation groove, a first curved surface is arranged on an outer peripheral wall of the cooperation cover, a second curved surface cooperating with the first curved surface is arranged on an inner peripheral wall of the cooperation groove, the rotating shaft is arranged on the cooperation cover, and the locking member is arranged on a top wall of the cooperation cover. a purification air duct, an air outlet frame of said purification duct, wherein the air outlet frame of a purification air duct is provided with a ventilation hole and a cooperation hole; a water tank drawer, wherein the water tank drawer is arranged on the air outlet frame of the purification air duct in a push-pull manner, and a safety locking member, wherein the safety locking member comprises a rotating shaft and a locking member, the rotating shaft is rotatably arranged in the cooperation hole between a locking position and an avoidance position, the locking member is arranged at the top of the rotating shaft, characterized in that the air treatment device further comprises two spaced-apart fitting protrusions are arranged on a bottom wall of the water tank drawer, the locking member is located on the front sides of the cooperation protrusions at the locking position to prevent displacement of the cooperation protrusions, and the locking member is located between the two cooperation protrusions at the avoidance position, wherein the air outlet frame of the purification air duct is provided with a cooperation groove, the cooperation hole is formed in a bottom wall of the cooperation groove, and the rotating shaft is arranged in the cooperation groove and is rotatably fitted to the cooperation hole, and wherein the safety locking member comprises a cooperation cover, the cooperation cover is rotatably located in the cooperation groove, a first curved surface is arranged on an outer peripheral wall of the cooperation cover, a second curved surface cooperating with the first curved surface is arranged on an inner peripheral wall of the cooperation groove, the rotating shaft is arranged on the cooperation cover, and the locking member is arranged on a top wall of the cooperation cover.