Atomizer and atomizing device

The utility model relates to an atomizer and an atomizing device.The atomizer comprises a shell, an atomizing assembly and an air outlet pipe, the atomizing assembly and the air outlet pipe are arranged in the shell, and a suction nozzle is arranged at the top of the shell; the atomization assembly comprises a sleeve and an atomization core arranged in the sleeve, and the sleeve, the air outlet pipe and the suction nozzle are sequentially communicated; the top end of the sleeve is inserted into the air outlet pipe, a sealing sleeve is clamped between the sleeve and the air outlet pipe in the circumferential direction, the sealing sleeve can wrap the outer circumferential wall of the top end of the sleeve, at least part of the structure of the sealing sleeve is located above the sleeve, a limiting protrusion is further arranged on the outer wall of the top of the sleeve, and the bottom of the sealing sleeve abuts against the limiting protrusion. According to the atomizer, the connection sealing performance of