The invention relates to a multi-passage valve body casting. The multi-passage valve body casting comprises a valve body, horizontal flow passages, a longitudinal flow passage and flow passage ports, the valve body is shaped like a cuboid, the two horizontal flow passages are arranged side by side in the valve body, the lower ends of the two horizontal flow passages communicate with each other via the longitudinal flow passage, the front and back of the valve body are respectively provided with two flow passage ports which communicate with the two horizontal flow passages, the middle parts of the two horizontal flow passages are respectively provided with three annular grooves, the upper ends of the annular grooves of the upper ends of the horizontal flow passages are provided with through holes, the openings of the through holes are located on the valve body, the left side of the middle annular groove of the left horizontal flow passage is provided with a through hole, the opening of the through hole is located at the left side of the valve body, the right side of the middle annular groove of the right horizontal flow passage is provided with a through hole, the upper ends of the annular grooves of the lower ends of the horizontal flow passages are provided with through holes, and the right side of the longitudinal flow passage is provided with a through hole. The multi-passage valve body casting has the following advantages: the design is simple, the multi-passage valve body casting is convenient to use and cast, and is ingenious and reasonable, the casting percent of pass is increased greatly, and the casting cost is reduced.