The invention discloses a portable gas met measuring device. The portable gas measuring device is characterized by comprising a sealing leakage-proof device, an electric gas suction device and a setting and measuring control system, the sealing leakage-proof device comprises an annular sealing combined cone, a fixed positioning ferrule and a clip-shaped gas sensor, the annular sealing combined cone is composed of a cone head, a cone body and an annular positioning sleeve, the fixed positioning ferrule is made of corrosion-resistant stainless steel, the clip-shaped gas sensor is clip-shaped and is mounted on the cone body of the annular sealing combined cone in a clamped manner, the electric gas suction device comprises a glass container, a motor, a reciprocatable rod, a sealing gas locking plug and a protection contact, and the setting and measuring control system comprises a control operation box, a touch screen, buttons, sensors and an alarming device. The portable gas measuring device can measure gas samples of different types and is high in leakage-proof sealability, convenient to use, high in sampling speed and suitable for being used in the field of environment protection or gas sampling of scientific research labs.