Preheat the oven to 350 degrees F (175 degrees C).

Beat sugar, oil, eggs, and salt together in a bowl using an electric mixer until creamy. Add zucchini and mix on low until blended. Add flour, baking soda, and cinnamon; beat until batter is smooth.

Pour batter into an ungreased 8x12-inch baking pan.

Bake in the preheated oven until a toothpick inserted into the cake comes out dry, about 20 minutes.