An accessory strap securing mechanism positioned on a portable electronic device to assemble an accessory strap thereon, the accessory strap securing mechanism includes an assembling portion and a securing member. The assembling portion is formed in the portable electronic device. The securing member includes a holding portion. The holding portion is received in the assembling portion. The holding portion includes a hook and a projection. The securing member is rotatable to allow the accessory strap to be coiled around the holding portion and a distal end of the accessory strap attached to the projection.