The invention discloses an oil gas explosion suppression method in a restricted space. The invention aims to suppress the explosion or extinguish the explosion flame in the early explosion stage. The method comprises the following steps: a, detecting a combustion or explosion signal of the restricted space; b, analyzing and judging the combustion or explosion signal; and c, according to the analytic result, starting the explosion suppressor to spray explosion suppressant, thereby achieving the goal of suppressing the explosion or extinguishing the explosion flame in the early explosion stage.