A slide assembly having an automatic retractable device includes a sliding member, a fixing base, a retainer, a guiding member provided on a sliding rail, and a stationary rail. The sliding rail is free to move with respect to the stationary rail. The sliding member is slidably disposed in the stationary rail. The fixing base is secured at the end of the stationary rail. The retainer is disposed in the stationary rail. The sliding member is linked to a first resilient member, which urges the sliding member back to the fixing base. An engaging plate is provided on the sliding member. The engaging plate has a first end and a second end. The first end of the engaging plate is pivotally connected to the sliding member. An engaging rod is provided on the second end of the engaging plate.