1. A power assembly, comprising:a motor, comprising a base body and a motor rotation shaft connected to the base body;
a fixing base, sleeved over the motor rotation shaft and connected to the base body, wherein the fixing base is provided with a first clamping portion; and
a propeller, comprising a base portion and a blade extending from the base portion, wherein the base portion is provided with a second clamping portion clamped to the first clamping portion, and the base portion is sleeved over the rotation shaft and is connected to the fixing base by clamping engagement between the first clamping portion and the second clamping portion;
wherein the power assembly further comprises an elastic component sleeved over the motor rotation shaft, the elastic component is a variable-diameter spring;
wherein one end of the elastic component abuts against a bottom surface of the base portion facing the base body, and the other end of the elastic component abuts against a base body of the motor;
wherein the power assembly further comprises a blocking ring sleeved over the motor rotation shaft and located above the elastic component, wherein one side of the blocking ring abuts against the base portion, and the other side of the blocking ring abuts against one end of the elastic component;
wherein a through hole is provided at the center of the blocking ring, and two arc-shaped gaps are further provided in the circumference of the blocking ring.