The invention discloses a multifunctional while-drilling shaft filter which comprises an upper connector. A lower port of the upper connector is in threaded connection with a mandrel through a drill stem buckle. The outer circumference of a thin neck of the middle of the upper connector is sleeved with a diversion connector. The inner wall of a lower port of the diversion connector is in threaded connection with the outer wall of the upper end of a steel brush body. The outer wall of a lower port of the steel brush body is in threaded connection with the inner wall of the upper end of an overflowing drum. The outer circumference of the middle of the steel brush body is fixedly provided with a steel brush belt. The middle of the overflowing drum is radially provided with a large overflowing hole. The outer circumference of the lower portion of the overflowing drum is provided with a slide groove in the axial direction. A limiting pin is slidably sleeved with the slide groove and fixedly connected with the inner wall of the upper portion of a filter drum. The outer wall of the middle of the filter drum is provided with a radial through diversion groove. The inner wall of the lower portion of the filter drum is fixedly connected with a collection drum through a fixing pin. The outer wall of the lower portion of the collection drum is connected with a chip discharge drum through a positioning pin. A lower port of the mandrel is in threaded connection with the inner wall of an upper port of a lower connector. The multifunctional while-drilling shaft filter is reliable in comprehensive performance, diversified in function, easy to operate and wide in applicability.