A hydraulic valve comprising a main body, a second main body, sealing elements, and a sealing package assembly. The first main body is fixedly connected to the second main body, the first main body having a cavity, the second main body having two cavities. The sealing elements are fixed between the first and second main bodies. The rear end of the sealing package assembly is fixed to the sealing elements, isolating the two cavities through the sealing package assembly. The second main body is provided with an inlet and an outlet, both connected to the two cavities. The sealing package assembly includes a storage cavity, which is in communication with the two cavities.