Silence and explosion sound prevention circuit on set-top box

The utility model provides a silence and explosion sound prevention circuit on a set-top box, which comprises a first PNP transistor, a second PNP transistor, a first NPN transistor, a second NPN transistor and a third NPN transistor. The first PNP transistor, an electrolytic capacitor, a sixth resistor and a fifth resistor form an explosion sound and silence prevention circuit for powering-up of startup, and the second PNP transistor, an electrolytic capacitor and a fourth resistor form an explosion sound and silence prevention circuit for powering-down of shutoff. The reliable silencing can be realized, and the problem of explosion sound in the powering-up of startup and powering-down of shutoff can be solved.