A steam iron is disclosed. The steam iron at least includes a base, a handle and a mechanical pump, in which the base has a steam generator and a water tank. The handle is connected with the base. The handle has a storage space and a shell surrounding the storage space. The mechanical pump is set in the storage space of the handle. The mechanical pump is connected with the steam generator and the water tank, and the bailing member of the mechanical pump is adjacent to the handle. The invention provides the mechanical pump having the bailing member that has short length and mounted in the handle. Because the bailing member may be hidden in the handle, user can easily press the bailing member without driving up finger to press the bailing member. So, the problem is solved that common steam iron is discommodiously used.