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With the increasing number of elevators in modern society, the safety of elevator is endangering people's life. However, the traditional elevator fault solutionis inefficient withthe high cost of manpower and resources, and the time needed for rescuing the trapped personnel is toolong. To solve these problems, an elevator safety remote monitoring system based on NB-IoT is designed to monitor the elevator operation status and call the maintenance person in time.It adopts a 32-bit low-power microcontroller (MCU)with model number STM32F103VCT6.The MCU realizes the information sensing, optimizes the communication, and controls the terminal and cloud information interaction. NB-IoT communication system is applied to satisfy the low-cost and low-power information interaction between the elevator operation status information acquisition terminal and the cloud server.Python and SQL Server are utilized for constructing the Web Server and database system, which receives, saves, manages and displays the fault information, running status, maintenance records and others. The remote monitoring system has the ability to monitor more than 100,000 elevators simultaneously, and currently has linked 1327 real running elevators. The proposed system has the advantages of strong practicability, high stability, good security and excellent expansibility.