Breast pump

The utility model discloses a breast pump which comprises a driving assembly and two breast pump bodies. Each breast pump body is provided with an air suction cavity, the driving assembly comprises an air suction pump, a first three-way valve, a second three-way valve, a first pressure relief pipe and a second pressure relief pipe, the air suction pump is communicated with the first three-way valve and the second three-way valve, and the air suction cavities are communicated with the first three-way valve and the second three-way valve in a one-to-one correspondence mode. The first three-way valve communicates with the first pressure relief pipe, and the second three-way valve communicates with the second pressure relief pipe. When the breast pump is used, the first pressure relief pipe is closed, the second pressure relief pipe is opened, the air suction cavity of one breast pump body can be vacuumized to suck milk, the other breast pump body is in a pressure relief state, and then the second pressure relief