A hollow fiber membrane module comprising: a plurality of submodules in which raw water is circulated and water treatment is carried out; a piping unit which is connected to the submodules and through which raw water, air, and treated water flow; each the submodules comprises: a housing forming an external appearance thereof, the housing being provided at one side thereof with a raw water inlet port, through which raw water can be introduced, an air inlet port, through which air can be introduced, and an outlet port, through which treated water can be discharged; at least one partition wall installed in the housing to partition an interior of the housing into a water treatment region and a raw water circulation passage, the partition wall being provided at opposite ends thereof with holes, through which raw water flows; a hollow fiber membrane disposed in the water treatment region arranged upright to carry out water treatment using pressure difference; a fixing part to fix the hollow fiber membrane to the housing; a collector communicating with an internal passage of the hollow fiber membrane to collect treated water having passed through the hollow fiber membrane, the collector communicating with the outlet port; an air diffusion pipe communicating with the air inlet port of the housing to spray air bubbles to the hollow fiber membrane; and a raw water passage communicating with the raw water inlet port and connected to the raw water circulation passage to supply raw water; wherein the piping unit comprises: a raw water pipe having a raw water connection port, through which raw water is supplied, formed at a side thereof, the raw water pipe being connected to the raw water inlet port of the submodule; an air pipe having an air connection port, through which air is supplied, formed at a side thereof, the air pipe being connected to the air inlet port of the submodule; a water collection pipe having a treated water connection port, through which treated water is introduced, formed at a side thereof, the water collection pipe being connected to the outlet port of the submodule; and a water discharge pipe, through which condensed water is discharged from the submodule; and a discharge port through which the air and the condensed water can be discharged provided above the submodule and being in connection with the water treatment region and the raw water circulation passage a plurality of submodules in which raw water is circulated and water treatment is carried out; a piping unit which is connected to the submodules and through which raw water, air, and treated water flow; a housing forming an external appearance thereof, the housing being provided at one side thereof with a raw water inlet port, through which raw water can be introduced, an air inlet port, through which air can be introduced, and an outlet port, through which treated water can be discharged; at least one partition wall installed in the housing to partition an interior of the housing into a water treatment region and a raw water circulation passage, the partition wall being provided at opposite ends thereof with holes, through which raw water flows; a hollow fiber membrane disposed in the water treatment region arranged upright to carry out water treatment using pressure difference; a fixing part to fix the hollow fiber membrane to the housing; a collector communicating with an internal passage of the hollow fiber membrane to collect treated water having passed through the hollow fiber membrane, the collector communicating with the outlet port; an air diffusion pipe communicating with the air inlet port of the housing to spray air bubbles to the hollow fiber membrane; and a raw water passage communicating with the raw water inlet port and connected to the raw water circulation passage to supply raw water; wherein the piping unit comprises: a raw water pipe having a raw water connection port, through which raw water is supplied, formed at a side thereof, the raw water pipe being connected to the raw water inlet port of the submodule; an air pipe having an air connection port, through which air is supplied, formed at a side thereof, the air pipe being connected to the air inlet port of the submodule; a water collection pipe having a treated water connection port, through which treated water is introduced, formed at a side thereof, the water collection pipe being connected to the outlet port of the submodule; and a water discharge pipe, through which condensed water is discharged from the submodule; and a discharge port through which the air and the condensed water can be discharged provided above the submodule and being in connection with the water treatment region and the raw water circulation passage