The invention discloses a foldable hand pump. The foldable hand pump comprises a pump support, a pump body, a crank and a handrail, wherein the pump support comprises an upper support, a lower support and a folding mechanism which connects the upper support with the lower support; the folding mechanism is symmetrically arranged and comprises a main plate, a ratchet, pawls, a fixed plate and a shifting connecting rod, wherein three pin roll holes are formed in the surface of the inner side of the main plate and pin rolls are respectively arranged in the three pin roll holes in a penetrating way; the ratchet is fixedly arranged on the pin rolls at the top of the inner side of the main plate; the pawls are fixedly arranged on the pin rolls at the bottom of the inner side of the main plate and convex teeth of the pawls are engaged with the concave teeth of the ratchet; the fixed plate is arranged on the three pin rolls in a penetrated way, and the fixed plate and the main plate jointly fasten the ratchet and the pawls; the two ends of the shifting connecting rod are respectively connected with the two symmetrical pawls; the side edge of the extended connecting part of the ratchet is fixedly connected with the upper support, and the lower edge of the main plate is fixedly connected with the lower support; the pump body is arranged on the upper support, the handrail is arranged on the upper support and the crank is installed on a rocker arm of the pump body. The foldable hand pump provided by the invention has the characteristics that the pump is simple to operate and is quick to unfold and fold, the space occupied by the folded pump is small, the stability is high and the like.