The white-browed pit viper is about 1 meter long and weighs 1.5 kilograms.

The head of the white-browed pit viper is relatively large, distinct from the neck, and the snout is short, wide and round. The small scales on the back of the head of the white-browed pit viper are ridged. The nostrils of the white-browed pit viper are larger and located at the upper end of the snout. The back of the body of the white-browed pit viper is brownish-gray, with 3 longitudinal large circular spots, the color of the center of each circular spot is purple or dark brown, the outer periphery is black, and the outermost has irregular black-brown markings. The abdomen of the white-browed pit viper is grayish-white with large dark brown markings.