The invention provides a surface mounted device (SMD) light emitting diode (LED) device and a display module thereof for an outdoor display screen. The invention solves problems of LED devices for current outdoor display screens, such as poor thermal discharge effect, complicated technology, low production efficiency, high cost, limited light emitting, and poor consistency. The display module provided by the invention effectively avoids quality problem of uneven light spots of the current outdoor display screens in the prior art, greatly improves quality and yield of the outdoor display screen, and reduces cost. The outdoor display module with the SMD LED device comprises an LED panel, a shell and sealing glue, wherein the LED panel is arranged inside the shell and the sealing glue is applied on the LED panel. The SMD LED device for the outdoor display screen has the advantages of low cost, simple structure and good thermal discharge effect and is suitable for down-stream batch production. The outdoor display module with the SMD LED device provided by the invention has low cost and simple technology, and can effectively improve resolution and quality of outdoor display screens.