A water timer is revealed. The water timer includes a base assembly,a valve assembly and a display module. The base assembly consists of afirst housing and a second housing. The valve assembly having aconducting tube and a valve member is for turning on or off water supply.The display module is composed of a first space, a circuit board, an inputmember, and a rectangular column connected to t first space and used forreceiving a battery box. The water timer features on that the displaymodule is arranged with an integrated rectangular column used forreceiving a battery box and the display module is locked on the firsthousing.
