Disclosed are a D2D signal detecting method and device, comprising: a user equipment determines a physical resource for discovery signal detection; the user equipment determines the number of discovery resources used by the discovery signals according to the physical resource area for discovery signal detection, or according to a discovery resource set of the discovery sequence contained in the discovery signal detected in the physical resource area, the number of discovery resources being the number of discovery resources used in one discovery period or in the physical resource area for sending the same discovery signal; the user equipment detects the discovery signals according to the determined number of discovery resources. The present invention can improve performance loss caused by D2D signal detection and can reduce the complexity of D2D signal detection by user equipment.