An apparatus and method for high-speed data transmission between virtual desktops are disclosed herein. The apparatus for high-speed data transmission between virtual desktops includes a reception unit, a destination determination unit, and a transmission unit. The reception unit receives data that is transmitted by virtual desktop servers inside a virtual desktop host server. The destination determination unit determines whether the destination of the data is the inside of the host server or the outside of the host server based on network identifiers set for the respective virtual desktop servers. The transmission unit sets up a data transmission method based on the destination of the data, and transmits the data using the transmission method.