The invention relates to a pressure-variable direct-acting overflow valve. The pressure-variable direct-acting overflow valve comprises a valve body, a valve element and a reset spring, wherein the valve element and the reset spring are arranged in the valve body, and the reset spring and the valve element are arranged in a staggered mode in the direction perpendicular to the movement direction ofthe valve element; and the valve body is further provided with a power lever used for allowing the reset spring and the valve element to be in transmission connection in a hinged mode, and the powerlever is provided with a driving end for driving the valve element and a driven end for applying force to the reset spring when the power lever rotates. After the system pressure reaches the opening pressure of the overflow valve, the valve element drives the power lever to rotate, the driven end of the power lever applies pressure to the reset spring, and the arm of force, acting on the power lever, of the valve element is increased along the rotation of the power lever; and after a system is stabilized, the overflow pressure is smaller than the opening pressure of the overflow valve and lower than the safety pressure of the system, so that the system is prevented from working at the highest pressure, and the hydraulic system is protected.