Covering cap locking device

The invention discloses a covering cap locking device. The covering cap locking device comprises at least two locks arranged in a cap; the adjacent locks are connected through a linkage mechanism; andat least one lock hole is formed in a covering cap. Each lock comprises a lock seat, a driving piece, a swing arm, a sliding block, a support and a pressing head; the sliding block is mounted in thesliding groove; one end of the swing arm is connected with the driving piece; the other end of the swing arm is hinged to one end of the sliding block through a connecting rod; the support is bent; one end of the support is hinged to the lock seat; a guide groove is formed in the middle of the support; the other end of the support is connected with the pressing head; a pulling pin is arranged at the other end of the sliding block; the end part of the pulling pin extends into the guide groove; and a lock seat mounting hole connected with the inner surface of the covering cap is formed in the lock seat. The covering cap