The utility model relates to an alarm devices based on USB mainly uses the equipment of scene for needing real time monitoring application system and equipment running state, the utility model belongs to the information and communication field. Including control end equipment, control end equipment has the USB interface and connects with the required computer of being connected, the inside main control chip that includes of control end equipment, the USB interface is connected with main control chip, and main control chip's input is connected with the control button, and main control chip's output is connected with display screen and wireless network interface card module, still is connected with the storage card at main control chip. The utility model discloses the method does not increase the software cost, effectively guarantees the requirement of alarm information promptness and accuracy through hardware to make the monitoring and forewarning system have more high -efficient and low -priced warning means.