The invention relates to a non-Newtonian fluid speed limiter. The non-Newtonian fluid speed limiter comprises multiple non-Newtonian fluid speed limiter bodies arranged in a groove, a pressing rod inseries connection with bottom ends of multiple pressure pushing rods and two cover plates buckled on an opening of the groove; one sides of the cover plates are hinged to the top edge of the groove, hook tongue plates are arranged on the other sides of the cover plates at intervals, the hook tongue plates of the two cover plates are embedded in a staggered manner, the hook tongue plates of the twocover plates extend reversely to form a pressure groove hole in a defined manner, and a pressing rod is embedded in the pressure groove hole. According to the speed limiter, through limiting of the descending speed of the cover plates, barrier of wheels can be achieved, the action that the wheels press the cover plates downwards can be transmitted by the pressure push rods, once the flow speed ofnon-Newtonian fluid is too fast, a resistance plate can be stopped, the flow speed and the flow of the non-Newtonian fluid are limited, descending of a thrust plug is limited, the descending speed ofthe cover plates can be limited, and the speed limiting effect is achieved. When the vehicle speed is not fast, the non-Newtonian fluid smoothly passes through the resistance plate, the cover platesare perpendicular to the road face, and a car can smoothly pass through a speed reduction belt.