The invention relates to an electrocardiograph monitoring system based on Internet of Things. The electrocardiograph monitoring system comprises an electrocardiograph collecting module, a main intelligent mobile terminal and an electrocardiograph monitoring module, wherein the electrocardiograph collecting module is connected with the main intelligent mobile terminal, the bidirectional communication is realized between the main intelligent mobile terminal and the electrocardiograph monitoring module, the electrocardiograph collecting module comprises a signal collecting end, a data processing module and a signal transmitting module which are sequentially connected, the data processing module is used for processing the collected electrocardiograph signal and sending to the main intelligent mobile terminal through the signal transmitting module, the main intelligent mobile terminal is used for sending the electrocardiograph signal to the electrocardiograph monitoring module, the electrocardiograph monitoring module comprises a remote communication module, a diagnosis and analysis module and an electrocardiograph signal database, the remote communication module is used for communicating with the main intelligent mobile terminal, and sending the received electrocardiograph signal to the electrocardiograph database to be stored, and the diagnosis and analysis module is used for extracting the received signal of the electrocardiograph database, diagnosing and analyzing the signal, and sending the results to the main intelligent mobile terminal through the remote communication module after diagnosis and analysis.