The invention discloses a railway data connection transmitter and relates to the technical field of a railway appliance. The left end of a housing is provided with a main input connector, the main input connector is connected with the input end of a processor, the output end of the processor is connected with a transmission data display apparatus and a data transmitter, the data transmitter is connected with a data encryption device, the data encryption device is connected with a plurality of data output connectors, and a power supply module is connected with the power supply end of the processor. The transmission method is as follows: the main input connector carries out data input and transmission, data is subjected to data processing through the processor, the data, after being processed, is transmitted through the data transmitter, during transmission, the data is encrypted through the data encryption device and is output through the data output connectors, and during the data transmission, the transmission data display apparatus carries out data display; and the railway data connection transmitter facilitates fast data transmission and encryption and is convenient to use, simple to operate and high in security.