Sorry, there are many grain wholesale markets in Linyi, but I have not found the largest one.

The following are the locations of some Linyi grain wholesale markets:

1. The intersection of Beiyuan Road and Dongyue Temple Street, Lanshan District, Linyi City.

2. 50 meters northeast of the intersection of Yimeng South Road and South Outer Ring Road, Luozhuang District, Linyi City.

I hope the above information can help you solve the problem. If you have any other questions, please feel free to let me know.