The present application relates to the technical field of big data, and in particular to a Ceph-based OSD blockage detection method and system, a terminal and a storage medium. The method comprises: by means of an OSD process, receiving an IO request; calculating a queuing time delay or a waiting time delay in respect of the IO request; determining whether the queuing time delay or the waiting time delay exceeds a set threshold value, wherein if the set threshold value is exceeded, determining that the OSD process is a blocked OSD, and sending to a monitor main node a blockage message in respect of the blocked OSD; by means of the monitor main node, receiving the blocking message, and calculating the blockage state of the blocked OSD, then controlling the operation state of the blocked OSD according to the calculation result of the blockage state. In the present application, further spread of IO blockage is prevented from occurring, thus ensuring stable operation of a Ceph cluster. Throughout the entire OSD blockage detection and cluster self-correction process, no manual intervention is required, and automatic cluster self-processing and maintenance are achieved.