The invention discloses an online monitoring method for a communication battery health degree. The current, the terminal voltage and the internal resistance of a storage battery under various different working states are monitored in real time, an improved ampere-hour method is used for calculating the capacity of the storage battery, and meanwhile, the influence of the discharge rate, the chargeefficiency and the temperature of the storage battery on the capacity is corrected, the state of health of the storage battery under a charge and discharge state can be quantified, and a basis is provided for the qualitative analysis of the state of health of the storage battery under a floating charge state so as to realize the all-around judgment of the state of health of the storage battery under the conditions of charge, discharge and floating charge. The method has the advantages of being high in applicability and accuracy, simple in implementation and the like, so that the method can beused for discovering storage battery individuals which may have hidden dangers in advance, the reliability and the guarantee level of the storage battery can be effectively improved, and the method ishigh in practicality.