The utility model discloses a video data encryption/decryption system rapidly connected to a safety access platform, and belongs to the power communication system field; the video data encryption/decryption system comprises video monitoring assemblies respectively arranged on each video monitoring point, a network access center arranged in a network access point, and an intranet assembly of a monitoring station and used for connecting with the safety access platform; the video monitoring assembly comprises a simulation signal acquisition module, a video encoding module, a first industrial control computer and a first wireless broadband communication terminal; an output end of the simulation signal acquisition module is connected with the first industrial control computer through the video encoding module; the first industrial control computer and the first wireless broadband communication terminal realize two-way connection through a network wire; the first wireless broadband communication terminals of each video monitoring assembly are connected in a wireless mode; the network access center comprises a second industrial control computer and a second wireless broadband communication terminal; the intranet assembly comprises an access gateway and a dynamic secret key manage machine. The advantages are that the video data encryption/decryption system is fast in processing speed, easy to realize, and low in power consumption.