Resistance adjustable shock absorbers are used on suspensions whose elastic elements are air springs. When working, as the load of the car increases, the air pressure in the air spring increases, and the air pressure in the air chamber that communicates with it also increases, and the diaphragm is forced to move down until it is balanced with the pressure generated by the spring. When the diaphragm moves down, it will also put pressure on the plunger rod and the plunger at the lower end to move down. When the position of the plunger relative to the orifice on the hollow connecting rod starts to block, the channel cross-sectional area of the orifice begins to decrease, so the amount of liquid passing through the orifice decreases, which increases the flow resistance of the oil. When the vehicle load is reduced, the plunger moves up, and the channel interception area of the orifice increases, reducing the flow resistance of the oil.