The utility model provides a lever pressure relief valve which comprises a valve body and a valve base, wherein the valve body comprises an installation flange, a connection flange and a bending pipe, the connection flange is arranged at the upper end of the bending pipe, the lower end of the bending pipe is communicated with the installation flange, the valve base pressed by a pressing ring is installed on the lower portion of the installation flange, a valve core is installed on the lower portion of the valve base, the valve core is connected with a valve rod, the valve rod is sleeved inside a guiding cylinder, the guiding cylinder is arranged on the installation flange, a valve rod joint is arranged at the upper end of the valve rod, the valve rod joint is connected with a connecting rod joint, a connecting rod is arranged at two ends of the connecting rod joint, and the connecting rod is connected with a tray. A lever principle is adopted to achieve the goal of setting a critical pressure of a process pipe system by symmetrically adjusting balance weight on the tray connected with the connecting rod. When a pipeline pressure exceeds the critical pressure in an operation process of equipment, the pressure relief valve opens under the pressure, and the pressure of the system is lowered. When the pipeline pressure is smaller than the set critical pressure, the pressure relief valve closes under the balance weight and keeps the pressure of the system stable.