The invention discloses a kitchen fuel gas alarm detection device, and the device comprises a gas collection module, an A/D converter module, a temperature collection module, an infrared detection module, a remote control module, a liquid crystal display module, a sound-light alarm module, a wireless communication module, a central controller, and a power supply. A collection output end of the gas collection module is connected with the central controller through the A/D converter module. The temperature collection module, the infrared detection module, the remote control module, the liquid crystal display module, the sound-light alarm module and the wireless communication module are respectively connected with the central controller. The invention also discloses an alarm detection method of the device. According to the invention, the device detects the concentration of fuel gas in a kitchen environment in real time, starts an alarm lamp and a buzzer to give an alarm if the concentration exceeds a set threshold value, and transmits information to a target cellphone terminal for real-time prompt, thereby achieving the real-time detection of the leakage of fuel gas in the kitchen, and eliminating the potential safety hazards.