Disclosed is a heart rhythm monitoring apparatus, including a water-proof case, a water-proof patch, at least two electrodes, a battery, and an electric circuit. The water-proof case is attached to the water-proof patch to form a water-proof space for accommodating the battery and the electric circuit. Each electrode is connected to the electric circuit, and outwards extends from the water-proof space to form a sensing end. The electrodes penetrate the water-proof patch and the water-proof patch and the sensing ends contact an animal skin. The water-proof patch provides adhesion, and the sensing ends are configured to sense electrical signal on the animal skin. The electrical signal is processed by the electric circuit, and the corresponding heart rhythm information is acquired and recorded. The present invention provides water-proof feature and possesses a simple structure, thereby improving convenience of use, prolonging operation period, acquiring a long-term record of heart rhythm information.
