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 . <EOS>