The present invention discloses a connection interface for a protective cloud printing terminal device. The connection interface comprises a printer, a spring, a lifting plate and a fixer, the printeris internally provided with a connection port, the upper and lower sides of the external portion of the connection port are provided with water-proof layers, the spring is installed at the lower portion of the outer side of the connection port, a fixing plate is arranged at the upper portion of the spring, a soft mat is installed at the upper portion of the fixing plate, a pressing plate is arranged at the upper portion of the soft mat, the lifting plate is installed at the portion of the pressing plate, the right side of the lifting plate is provided with a gear, the right side of the printer is provided with a protection cover, and a rotation shaft is arranged at the upper portion of the protection cover. The connection interface for the protective cloud printing terminal device is provided with a water-proof layer to perform protection of the connection port so as to prevent the circuit of the internal portion of the printer from short circuit due to moisture in the air through theconnection port and reduce the possibility of damaging of the device.