Beer foamer

The invention relates to auxiliary tools for beer drinking, in particular to a beer foamer, which comprises an upper cover (1) and a lower cover (4), wherein a PCB (2), a beer outlet pipe (7) and an ultrasonic head (8) are mounted in the upper cover (1) and the lower cover (4); the PCB (2) is electrically connected with the ultrasonic head (8); the ultrasonic head (8) is next to the beer outlet pipe (7); the PCB (2) is connected to a battery in a battery cover (5) through a power button (3); the top of the beer outlet pipe (7) extends out of the upper cover (1); the bottom of the beer outlet pipe (7) extends out of the lower cover (4); and an opening in the bottom of the beer outlet pipe (7) is matched with the bottle mouth of a beer bottle (6). The beer foamer is convenient to control, fine and uniform in foaming, small in size and convenient to store.