The invention relates to a cardiechema electrocardio micro in-situ synchronous detecting sensor based on an MEMS technology. The sensor comprises a shell, wherein the shell is fixedly provided with atransaudient cap, the shell is internally provided with a supporting plate, the supporting plate is provided with an MEMS sonic transducer microstructure, and the MEMS sonic transducer microstructureis composed of a supporting frame, a central mass block, cantilever beams and four varistors; the periphery of the shell is sleeved with a ring of electrocardiographic electrode, and the periphery ofthe electrocardiographic electrode is provided with a ring of sucking disc; the electrocardiographic electrode comprises a flexible conductive substrate of which the top face is designed in a pinpointtype microarray, a metal seed layer and a metal layer are sprayed sequentially on the top face of the flexible conductive substrate, and the back face of the flexible conductive substrate is coated with a conductive silver paste layer. Compared with a traditional echometer or electrocardiogram sensor, the sensor utilizes the MEMS technology to integrate cardiechema and electrocardio, thereby achieving multi-parameter joint analysis and diagnosis of a coronary heart disease, the sensitivity is high, the volume is small, batch processing can be achieved, and the cost is low.