The invention discloses a non-airbag blood pressure detection method and system based on electrocardiosignals. According to the non-airbag blood pressure detection method and system based on the electrocardiosignals, the corresponding characteristic index is obtained by acquiring the electrocardiosignals and the pRRx sequence corresponding to the electrocardiosignals and carrying out linear analysis and/or non-linear analysis on the pRRx sequence, the calculated characteristic index and the corresponding blood pressure value are used as input and labels, machine learning is carried out, and training is carried out to obtain a model function of the corresponding relationship between the characteristic index of the electrocardiosignals and the blood pressure value; and when the blood pressure value at a certain time point is to be detected, the blood pressure value at that time point is obtained by acquiring the electrocardiosignals before that time point and calculating the blood pressure value according to the characteristic index of the electrocardiosignals and through the model function. Compared with the prior art, the method has low cost, safety and effectiveness, easy continuous measurement operation and good user experience by acquiring electrocardiosignals as source signals through non-invasive and non-airbag, and the blood pressure detection process of the method is small in calculation amount, low in algorithm complexity and high in efficiency.