The invention relates to the technical field of traffic safety, in particular to an intersection real-time intelligent safety warning system based on intelligent phones and cloud computing and an implementation method of the intersection real-time intelligent safety warning system. The existing GPS navigation technology and precision are utilized, and the intersection real-time safety warning is achieved based on the hardware technology of the intelligent phones and the cloud computing software technology. The intelligent phones of drivers / passersby are utilized, the longitude and latitude of the position are determined, running / walking speed is calculated, the longitude and latitude of the position and the running / walking speed are uploaded to a server of the system through a cloud platform, the server computes the distance between the running vehicles / walking passersby and intersections based on the intersections, computation is carried out, the probability that traffic conflict happens to the running vehicles / walking passersby is judged, and if the traffic conflict possibly happens to the running vehicles / walking passersby, warning messages are sent to the intelligent phones of the drivers / passersby in real time, and the intelligent phones send out the warning through vibration / sounds / voices after receiving the messages. Only a small client side program provided by the system needs to be downloaded and installed, special hardware equipment is not needed by a user, and implementation and popularization are easy. All the varieties of the traffic conflict can be avoided.