The utility model relates to an oral appliance with a light source and convenient use, particularly consisting of a stomatoscope, a laryngoscope and a spatula. The oral appliance with the light source is a stomatoscope which consists of two parts: a stomatoscope lens and a light source bar; the light source bar is provided with a battery and a luminescent lamp; the end of the stomatoscope is provided with a reflecting lens which is aligned with the luminescent lamp. As the oral appliance with the light source has a split-type two-section structure and can be conveniently placed in an oral appliance box and is sanitary, safe and convenient to carry. As the oral appliance is provided with the light source, the oral appliance can always aligns to the reflecting lens or a diseased position, does not need to adjust outside rays when the checkup and treatment are carried out by a doctor and is very convenient to use.