The invention discloses a video transmission method of uniform output of mixed protocol data; the practice environment comprises a subordinate data access platform or device, a data transfer server and a client; the subordinate data access platform or device receives a video flow collected by a subordinate device and sends to a data transfer server; the video data transmission method includes access of private data by a TCP protocol method and access of national standard data by UDP protocol; the data transfer server receives video data sent by the subordinate data access platform or device; the private data is accessed by the TCP protocol method; the national standard data is accessed by UDP protocol method; the client selects the video transmission method and sends a request to the data transfer server according to current application scene and network load condition, acquires the video data and perform the encoding display operation. The video transmission method of uniform output of mixed protocol data is simple to realize, low in cost, and good in applicability.