The body is 5–7 millimetres (0.20–0.28 in) long, the head and pronotum are brownish, while elytrae are shining metallic green with a bright red spot at the end.

Along the sides of the abdomen this species has a peculiar structure with orange pouches.

In case of necessity, this beetle can release a smell that deters predators.

The males attract females producing special secretions from its antennae.

Malachius bipustulatus is an insect with a complete metamorphism, (or holometabolism), with four life stages (egg, larva, pupa and imago or adult).