A lock and security structure for a connection receptacle includes a connection port, a pawl portion, and a lock and security portion. The connection port forms a receiving space and a slide channel in the receiving space. The pawl portion includes a fixed end and the pawl portion is located adjacent to an end surface of the connection port. The pawl portion forms at least one barb. The lock and security portion includes a bar portion and a board portion. The bar portion is formed on one end of the board portion. The lock and security portion is movable along the slide channel in the slide channel. When the lock and security portion is moved to a first position, the bar portion engages the pawl portion and when moved to a second position the bar portion disengages from the pawl portion.