The invention relates to the technical field of communication, in particular to a method for on-line automatic monitoring of EOC modules at an EOC local side. The method comprises the following steps of running an EOC module monitoring process, recording MAC addresses corresponding to the current on-line EOC modules and polling the on-line number of the EOC modules; comparing the on-line number of the EOC modules, if the number is inconsistent, polling whether switch ports of the EOC modules which are likely to be abnormal are in UP state, if yes, judging that the EOC module has a fault and continuing polling whether the abnormal EOC module is back to normal; and if the EOC module is still abnormal, judging that the EOC module has the fault. The method has the beneficial effects that a highly automatic detection function is realized from the software perspective, the on-line running state of the modules is automatically detected, the reliability is improved through repeated detection, the faulty modules are quickly recovered, and the customer use influence is reduced.