Disclosed are a synchronized suction device (1) able to be concealed on a womans body and a breast pump convenient to carry for portable use. The synchronized suction device (1) is of flat structure and a disc-shaped diaphragm (12) is provided in an inner cavity thereof. The disc-shaped diaphragm (12) is obliquely oriented so as to separate the inner cavity into two wedge-shaped spaces facing in opposite directions, the wedge-shaped space in the upper position is an air chamber (15), and the wedge-shaped space in the lower position is a liquid flow room (14). The air chamber (15) has an air current interface (111), the liquid flow room (14) has a liquid inlet interface (131) and a liquid outlet interface (132). The disc-shaped diaphragm (12) comprises a normally open valve (141) in the middle thereof. The breast pump comprises cups (2), an air pump (4) and a milk pouch (3), and further comprises the above-mentioned synchronized suction device (1). An air hole (411) of the air pump (4), a milk outlet (211) of the cups (2) and a milk inlet (311) of the milk pouch (3) are respectively connected to the air current interface (111), the liquid inlet interface (131) and the liquid outlet interface (132) of the synchronized suction device (1) using hoses. The synchronized suction device is small in volume and suitable for concealing on the body, and inverting the disc-shaped diaphragm (12) enables a relatively large negative pressure to be obtained instantly, meeting the needs of pumping milk. When the diaphragm is restored, the valve (141) opens, enabling milk to quickly flow into the milk pouch (3) under the effect of ordinary pressure.Linvention concerne un dispositif daspiration synchronisée (1) qui peut être dissimulé sur le corps dune femme et un tire-lait facile à transporter pour un usage portatif. Le dispositif daspiration synchronisée (1) présente une structure plate et une membrane en forme de disque (12) est disposée dans une cavité correspondante. La membrane e
