A vehicle courtesy projection system, characterized in that, comprises: a trigger module, a first control module and a projection module, wherein the trigger module and the first control module are adapted to be located within the vehicle; the trigger module connected with the first control module, and the first control module connected with the projection module; the trigger module configured to receive a projection information sent by a client and send the projection information to the first control module, wherein the client comprises a smart phone; the first control module configured to receive the projection information and control the projection module to project according to the projection information; the projection information comprises a projection instruction and projection content, and the first control module is configured to: receive projection instruction and projection content; control the projection module to project the projected content according to the projection instruction; the projection instruction comprises all of a start projection instruction, a pause projection instruction, a switch projection instruction and a close projection instruction; the projection content comprises all of a video, a dynamic pattern, a static pattern and a preset projection sequence; the trigger module comprises a receiving module and a first storage module; the receiving module is configured to receive the projection information and send the projection information to the first storage module; the first storage module is configured to receive the projection information and store it; the projection module comprises a projection component and a second control module; the second control module connected with the first control module; the first control module can send the projection information to the second control module, the second control module can control the projection component to project according to the projection information, and the second control module can store the projection information. the trigger module connected with the first control module, and the first control module connected with the projection module; the trigger module configured to receive a projection information sent by a client and send the projection information to the first control module, wherein the client comprises a smart phone; the first control module configured to receive the projection information and control the projection module to project according to the projection information; the projection information comprises a projection instruction and projection content, and the first control module is configured to: receive projection instruction and projection content; control the projection module to project the projected content according to the projection instruction; the projection instruction comprises all of a start projection instruction, a pause projection instruction, a switch projection instruction and a close projection instruction; the projection content comprises all of a video, a dynamic pattern, a static pattern and a preset projection sequence; the trigger module comprises a receiving module and a first storage module; the receiving module is configured to receive the projection information and send the projection information to the first storage module; the first storage module is configured to receive the projection information and store it; the projection module comprises a projection component and a second control module; the second control module connected with the first control module; the first control module can send the projection information to the second control module, the second control module can control the projection component to project according to the projection information, and the second control module can store the projection information. receive projection instruction and projection content; control the projection module to project the projected content according to the projection instruction; the projection instruction comprises all of a start projection instruction, a pause projection instruction, a switch projection instruction and a close projection instruction; the projection content comprises all of a video, a dynamic pattern, a static pattern and a preset projection sequence; the trigger module comprises a receiving module and a first storage module; the receiving module is configured to receive the projection information and send the projection information to the first storage module; the first storage module is configured to receive the projection information and store it; the projection module comprises a projection component and a second control module; the second control module connected with the first control module; the first control module can send the projection information to the second control module, the second control module can control the projection component to project according to the projection information, and the second control module can store the projection information.