The present invention relates to a sterilization module a water purification device and a system comprising a water purification device. According to an embodiment there is provided a sterilization module comprising: a channel body unit having a channel formed therein such that water passes through the same； an ultraviolet ray emission unit provided to emit ultraviolet rays towards the channel； a mounting unit in which the ultraviolet ray emission unit is installed the mounting unit being formed on the channel body unit such that an installation space in which the ultraviolet ray emission unit is installed and the channel are connected； and a holder coupled to the mounting unit so as to hold the ultraviolet ray emission unit inside the mounting unit.
