A cartridge, an atomizing assembly and an electronic cigarette thereof are provided. The cartridge includes a cartridge housing, a reservoir chamber, an intake passage, and a smoke outlet passage； the reservoir chamber, the intake passage, and the smoke outlet passage are received in the cartridge housing, the intake passage and the outlet passage are disposed at the same side of the reservoir chamber. And the same side placement of the intake passage and the smoke outlet passage is compact in structure, the air inlet passage and the smoke outlet passage are arranged next to each other, the length of the air passage from the air inlet to the air outlet is shortened. Therefore, the problem that the user needs to pump vigorously to suck out the smoke is effectively solved, and the user's inhale is more convenient and labor-saving.
