The invention discloses a low-cost NB-IOT (Narrow Band Internet of Things) wireless intelligent lock, which comprises a controller, a safety lock, a battery and a communication module, wherein the controller is electrically connected with a biological recognition module, an NFC (Near Field Communication) module, a keyboard module and a storage module; the safety lock comprises a sound and light warning device, a lock body picking detection module and a lock body driving and lock body detection module; the battery is electrically connected with the battery volume detection module; the battery is electrically connected with the controller, the safety lock and the communication module; the communication module also comprises an NB-IOT module and a BLE module. By using the NB-IOT technology, the low-cost NB-IOT wireless intelligent lock has the characteristics that the power consumption is low; the signal coverage range is wide. The BLE module realizes the Bluetooth low energy consumption, so that the electric power is further saved; on one hand, the problem of short service life of the battery power supply equipment such as the intelligent lock is solved; on the other hand, the condition that a gateway needs to be additionally arranged for intelligent lock communication conversion is avoided. The device has the advantages of multifunction, low cost, energy conservation and environment protection.