The invention provides a mechanical automatic cutting control device. The mechanical automatic cutting control device comprises a left baffle, a right baffle, a transverse supporting plate and a controller. A fixing plate is arranged on a transverse fixing beam. A conveying belt is arranged on the fixing plate. The upper portion of the left baffle and the upper portion of the right baffle are fixedly connected through the transverse supporting plate. An electric telescopic rod is installed on the controller. A power mechanism is arranged at the upper end of the electric telescopic rod. A control unit is arranged in the controller and composed of a relay, a battery, an embedded central processing unit and a memorizer. Compared with the prior art, the mechanical automatic cutting control device has the following beneficial effects that the mechanical automatic cutting control device is convenient to operate, good in stability, high in reliability, ingenious in design and fully automatic, the market competitiveness is improved, the purposes of simple structure and reasonable design are achieved, manual intervention is not needed, and efficient and accurate production efficiency is achieved.