A fast installation structure on a faucet table, comprising: a table plane and a bottom seat. The bottom seat is disposed on the table plane, and is used to install a faucet, including: a connection tube; a lock tight device, disposed and screwed around the connection tube; and at least two position holding block, disposed at a lower portion of the connection tube, and are repulsive to each other magnetically. The lock tight device is a lock tight ring or a lock tight screw. The outer threads are provided on the connection tube, while inner threads are provided on the lock tight ring, such that the lock tight ring and the connection tube are connected through threading. At least two installation slots are disposed symmetrically at a lower portion of the connection tube, for receiving the position holding blocks.