The invention discloses a double-linkage hydraulic control device. The double-linkage hydraulic control device consists of a hydraulic motor switch, a linkage plate, a connecting rod, a support, a stay wire, a brake plate, a brake line, a brake pad, a hydraulic motor, a pneumatic key, an air pump, a connecting air pipe and a brake air pocket. The double-linkage hydraulic control device is characterized in that the air pump is arranged at the lower end of the support; the connecting air pipe is connected to one side of the air pump; the pneumatic key is arranged on the other side of the air pump; the stay wire is arranged on one side of the upper end of the support; the connecting rod is arranged on the other side of the upper end of the support; the stay wire can draw the connecting rod to slide together; the other end of the connecting air pipe is connected with the brake air pocket; the other end of the stay wire is connected with the brake plate; the other end of the connecting rod is arranged in the middle of the linkage plate; the brake plate is connected with the brake pad by the brake line; the hydraulic motor switch is arranged on the hydraulic motor; the upper end of the hydraulic motor switch is connected with one end of the linkage plate; and the upper end of the pneumatic key is connected with the other end of the linkage plate in a sliding hole form, so that the device is high in safety, reliability, practicability and loading capacity.