A noise-reducing headset, comprising a suspending arm, a connection device, and an ear cover part is disclosed. An engaging device is disposed on both ends of the suspending arm, wherein a position fixing part is disposed on one end of each of the engaging devices. Both ends of each of the connection device are respectively provided with a pivot joint part and an opening for engaging the engaging device. One side of the connection device is provided with a hollow slot. The hollow slot is communicated with the opening such that the position fixing part adjusts the distance the suspending arm entering into the connection device. Moreover, the ear cover part is connected to the pivot joint part of the connection device such that the noise-reducing headset can be collapsed inward by using the pivot joint part to make the noise-reducing headset convenient for a user to take along.