The invention discloses an automatic foaming cleaner. The cleaner comprises a brush, a brush head part located at one end part of the brush and a drive device arranged in the brush, wherein a passage and a cavity communicating with the passage are arranged at the brush head part, a foam stirring device is arranged at the brush head part and located in the position of the cavity and is in transmission connection with the drive device. The automatic foaming cleaner enables a cleaning solution accommodated in the cavity to foam automatically through the drive device, the foam stirring device and the bush head part, treatment of the cleaning solution by hands of a user for foaming or direct pouring of the cleaning solution to a to-be-cleaned position in a cleaning process is not needed, so that consumption of the cleaning solution is reduced, the hands of the user are protected, and the use is convenient.