The invention discloses a locomotive vehicle display control apparatus, system and method. The apparatus is based on a programmable logic device and comprises an LCD control module used for performing read-write control on data output by a processor module and outputting the data to an LCD display module; a low-temperature heating control module used for driving an external heating module to generate heat to heat the LCD display module when the temperature of the locomotive vehicle display control system is lower than a heating limit value; an over-temperature alarm control module used for driving an external over-temperature alarm driving module to perform over-temperature alarm when the temperature of the locomotive vehicle display control system is higher than a high temperature limit value; and an LED backlight control module used for generating PWM signals according to the change of the ambient brightness and outputting the PWM signals to the LCD display module for brightness adjustment. According to the apparatus, system and method, technical defects that in the prior art, a lot of processor resources need to be occupied, the universality and the practicality are not high, and purchase and halt production risks exist in key devices are overcome.