Foldable windmill

A foldable pinwheel, comprising:

• a central pole;
• and
• a blade assembly rotatably disposed on the central pole;
• wherein, the blade assembly comprises a plurality of rotary blades and at least one locking mechanism, which is rotatably disposed on the central pole and used for securing the rotary blades;
• the plurality of rotary blades can be stacked up together when the locking mechanism is in an unlocked state, and the locking mechanism can secure the plurality of rotary blades in a stacked up position;
• the locking mechanisms further comprise:
• a base, rotatably disposed on the central pole and having a support running through one end of the rotary blade;
• a locking sleeve, capable of attaching to the support to secure one end of the rotary blade to the base;
• a locking lid which is sheathed on the support,
• a limiting block which is arranged on an inner side of the locking lid;
• a limiting slot to limit movement of the limiting block, is formed at one end of at least one of the rotary blades;
• the locking sleeve is locked with the support, the inner side of the locking lid gets close to and comes into contact with the rotary blade;
• wherein external locking threads are formed on the support, internal locking threads fitting with the external locking threads are formed on the locking sleeve, and a rib is arranged on the periphery of the locking sleeve.