Abstract: A dust collection guide structure (10) arranged at the bottom (11) of a shell of a dust collection mechanism comprises an air duct suction opening (12) formed in the bottom (11) of the shell and at least one groove (13) formed in the surface of the bottom (11) of the shell. One end of each of the at least one groove (13) communicates with the air duct suction opening (12) to form a dust guide air duct for guiding dust into the air duct suction opening (12), and the other end is in smooth transition connection with the edge of the bottom (11) of the shell.