Proceratophrys boiei is a moderate-sized, robust frog, growing to a length of between , with males tending to be slightly smaller than females. Both head and body are relatively broad, the snout is rounded, and long, tapering peaks of skin project from above the eyes. The surface of the skin on both back and flanks is covered with warts. The colouring is an irregular geometric pattern of brown, black, yellow, orange and red, such that the frog becomes nearly invisible against the background of leaf litter among which it lives. There is also a broad brown or grey dorsal stripe.
