The invention provides an adjustable decibel stethoscope, which is mainly provided with an earpiece, which is arranged on a Y-shaped catheter, and a connecting piece is respectively arranged on two opposite ends of the Y-shaped catheter. The piece is made of metal material, one end of the connecting piece is provided with an internal screw hole, the other end of the connecting piece is provided with a perforation, the perforation is connected to the inner screw hole, and an adjustment is provided on the connecting piece The adjustment part is made of metal material, the adjustment part is provided with a convex column at the outer end, the convex column is provided with an internal screw hole, an earplug is arranged on the convex column of the adjustment part, the earplug is made of Made of silicone material, the earplug is provided with a screw, the screw is screwed in the inner screw hole of the adjusting member and the inner screw hole of the connecting member, the screw hole is provided with a sound hole, the sound hole is penetrated to On the outer side of the earplug, the screw located inside the earplug is set as a tapered section. In this way, by adjusting the output decibels of the two earplugs separately, the volume decibels heard by the two ears can be balanced.本發明係在提供一種可調整分貝之聽診器，主要係設有一聽頭，該聽頭係設於一Y型導管上，該Y型導管之相對二端部上分別組設有一連接件，該連接件係由金屬材質所製成，該連接件內之一端設有內螺孔，該連接件內之另一端設有一穿孔，該穿孔係連通於該內螺孔，該連接件上組設有一調整件，該調整件係由金屬材質所製成，該調整件之外端設有一凸柱，該凸柱內設有內螺孔，該調整件之凸柱上組設有一耳塞，該耳塞係由矽膠材質所製成，該耳塞內設有一螺桿，該螺桿係螺設於該調整件之內螺孔及該連接件之內螺孔內，該螺桿內設有音孔，該音孔係穿通至該耳塞外側，該螺桿位於該耳塞之內部係設為錐狀段，如此，藉由分別調整二耳塞之出音分貝，使二耳聽到之音量分貝可達到平衡。
