The invention belongs to the field of signal detecting and provides a seismic signal collecting node. Signals obtained by the node are high in quality, system performance is good, and variable channel number collecting work, various-self-detecting-information collecting and measuring can be achieved. According to the technical scheme, the seismic signal collecting node with the adjustable sampling rate and a self-detecting function comprises an order configuration and data processing module, a synchronous control module, a signal collecting module, an odd channel control module, an even channel control module and a phase-locked loop. The synchronous control module receives a synchronous clock downloaded by a transmission node and transmits the synchronous clock to the odd channel control module, the even channel control module and the phase-locked loop in the collecting node for collecting synchronous control of the modules of the collecting node. The odd channel control module and the even channel control module receive orders issued by an order receiving module and carry out corresponding processing on the orders, receive seismic signals collected by an odd channel and an even channel respectively and control the odd channel and the even channel respectively. The phase-locked loop is used for controlling synchronization of collecting channels. The seismic signal collecting node is mainly used for signal detecting.