An LED display screen controller (10, 31) and a display control system (30) are provided. The LED display screen controller (10, 31) includes: an embedded processor (11, 311); a first WiFi component (14, 313); a second WiFi component (15, 314); a wired network component (16, 315); a first Ethernet PHY chip (17, 316), connected between the wired network component (16, 315) and the embedded processor (11, 311); a programmable logic component (12, 312), connected to the embedded processor (11, 311); and an output port (18), connected to the programmable logic component (12, 312) and configured to connect an LED display screen (33). The embedded processor (11, 311) is configured to configure the first WiFi component (14, 313) to work in an AP mode, and the second WiFi component (15, 314) is adapted to work in a Station mode when the first WiFi component (14, 313) works in the AP mode.