There is no quick way to drop all tables of a MySQL database. You can just drop the database instead. But if you just want to drop all tables, you can use following codes.

mysql -u root -pPASSWORD DatabaseName -e "show tables" | grep -v Tables_in | grep -v "+" | \gawk '{print "drop table " $1 ";"}' | mysql -u root -pPASSWORD DatabaseName

I found the code from another website but it was for password-less MySQL servers. I added password authentication.