The present invention provides a transmission resource determining method and a related device. The method includes: receiving, by a first device, status information sent by all devices in a region; determining, by the first device, an idle resource in a resource pool according to a transmission pattern and resources in the resource pool that are used when all the devices in the region send the status information; and determining, by the first device according to a first rule, a first transmission resource from the idle resource as a resource for sending status information of the first device.