The invention provides an intelligent electrocardiogram monitoring system which is formed by a three-operational-amplifier measuring amplification module, a blocking and low-pass filtering module, an optoelectronic isolation module, a wave trapping module, a rear-arranged amplification filtering module, a data collecting module, a microprocessor and a power module. The three-operational-amplifier measuring amplification module is connected with the blocking and low-pass filtering module which is connected with the optoelectronic isolation module. The optoelectronic isolation module is connected with the wave trapping module which is connected with the rear-arranged amplification filtering module. The rear-arranged amplification filtering module is connected with the data collecting module which is connected with the microprocessor. The intelligent electrocardiogram monitoring system can monitor the health states of hearts of high-risk groups of cardiovascular disease accurately in time, and morbidity of cardiovascular disease can be reduced.