The invention discloses a cable anti-slack device of a retractable chain-slat conveyer. The cable anti-slack device of the retractable chain-slat conveyer is characterized by comprising a base, wherein the base is integrally fixedly connected with a positioning block which is arranged in the vertical direction; a strip-shaped positioning hole is formed in the positioning block in the vertical direction; the inside of the positioning hole is slidably connected with a pull rod which is arranged in the front-back direction; outer threads are arranged on the rear half part of the pull rod; a front positioning nut and a rear positioning nut are assembled on the outer threads; the front positioning nut is positioned in front of the positioning block; the rear positioning nut is positioned at the rear of the positioning block; a rotary connector is mounted at the front end of the pull rod and is connected with a steel cable pull wire; and a corrugated pipe sleeves the steel cable pull wire. Micro-adjustment in the left-right direction is realized by adjusting the left positioning nut and the right positioning nut on mounting screws, or micro-adjustment in the up-down direction is realized by adjusting the front positioning nut and the rear positioning nut, and therefore, the original trend of a cable cannot affect movement of a conveying belt when the cable is tensioned.