The invention discloses an industrial plug used for a sea transportation refrigeration container. The industrial plug comprises a plug base. The plug base is provided with an insertion core fixing plate. A plug pressing plate matched with wiring insertion core assemblies sleeves the upper end of the insertion core fixing plate. The lower end of the plug pressing plate is provided with a ring-shaped clamping block in a protruding manner. The upper end of the plug base is provided with a first clamping ring and a second clamping ring, and an annular groove is formed between the first clamping ring and the second clamping ring. The annular groove is internally provided with two tension springs which are respectively fixed to the plug pressing plate from two sides. A first clamping groove and a second clamping groove, which are arranged at an interval, are formed in the inner side of the second clamping ring. A slideway is arranged between the first clamping groove and the second clamping groove. A rotation braking pin is upwards jacked up and rotated, the plug pressing plate rotates along with the rotation braking pin under the effect of the tension springs, and a rotation clamping block is enabled to switch within the first clamping groove and the second clamping groove. According to the invention, the plug pressing plate is provided with the tension springs, and only when the rotation clamping block is clamped into the first clamping groove or the second clamping groove, the rotation clamping block is stabilized; and if the rotation clamping block stops on the slideway, the rotation clamping block is immediately pulled back to an original position under the active forces of the tension springs.