Atomizer and aerosol generating device

The invention provides an atomizer and an aerosol generating device.The atomizer comprises an oil bin shell, a suction nozzle support, an atomizing assembly, an oil bin silica gel plug and an oil bin bottom cover, the center of the top end of the oil bin shell is concaved inwards to form a connecting pipe, a suction pipe is axially arranged in the middle of the suction nozzle support, and a groove is formed in the outer wall of the suction pipe; a protruding positioning block is arranged at the bottom end of the connecting pipe, and a suction pipe on the suction nozzle support is inserted into the connecting pipe on the oil bin shell. The operation that a silica gel plug is plugged at the opening of an atomizer air channel in order to prevent oil leakage in a traditional mode is not needed, the situation that the sealing effect cannot be achieved due to the fact that operation is not standard or sliding-out and falling-off occur due to vibration in the carrying and transportation engineering is avoided, and t