The invention discloses an indoor distribution hidden fault troubleshooting method and device. The method comprises the steps of obtaining MRO (Measurement Report Original) data; analyzing the MRO original data to obtain MRO formatted data; calculating a coverage extension index related to RSRP (Reference Signal Receiving Power) of a service cell according to the MRO formatted data; and determining whether a hidden fault exists in the service cell or not according to the coverage extension index.