The invention discloses a pre-positioned water purification module, which comprises a first housing, a second housing and a filter core, The first housing and the second housing are detachably connected to form an outer casing having a casing chamber inside, and the outer casing is provided with a water inlet and a water outlet, the filter core is disposed in the casing chamber to communicate withthe water inlet and the water outlet, wherein at least one of the water inlet and the water outlet is configured to a structure not protruding from the contour of the outer casing, and the water inlet and the water outlet are respectively provided with a connection portion installed with a water flowing pipeline. The implementation of the technical solution can achieve excellent anti-vibration, anti-jitter, anti-water flow impact and the like without increasing a connection mechanism of the pre-positioned water purification module and a water inlet pipe and a water outlet pipe. The filter core of the pre-positioned water purification module has a multi-stage filtering structure, and the design fully considers the water environment of a washing machine, and maintains good filtering performance even under strong, frequent and unstable water flow impact.