The invention discloses a portable breast pump, which comprises a feeding bottle for containing milk, a tee, a sucker, an air bag, an air bag lifting block, and a pressing handle. The feeding bottle is connected to the lower port of the tee; the air bag is installed on the upper port of the tee; the sucker is detachably connected to the side port of the tee; a tee shell covers the lower port of the tee; the top of the tee shell is provided with a groove, which extends down along the lateral side to the side port; the middle part of a horizontal section of the groove is provided with an airbaglifting block outlet; a pendant section of the groove is provided with a catheter outlet for the sucker to penetrate through; and the pressing handle is a foldable handle folded in the groove. The portable breast pump of the invention is very convenient for assembling and disassembling, does not occupy space when carried, is especially suitable for being carried in a bag, and will not be damaged by other items in the bag.