A collapsible musical drum with collapsible drum shell is disclosed in the present invention. Said musical drum is comprised of a base drum member with a drum head and a drum shell, and a plurality of shell extension member which can be attached to the drum shell. The shell extension members attached to the drum shell can form a collapsible drum shell either in an extended, or a collapsed status. Thus the musical drum has an adjustable size of a resonate chamber formed by drum head and drum shell and thus produces various sounds. When in collapsed status, the musical drum can save spaces and is easier for transportation.