A blocking module is used for blocking at least an object from passing through a rail. The blocking module includes a linkage member and a blocking member. The linkage member has a first end and a second end, and there is a buffering space at a side of the first end. The blocking member has a pivoting end and a free end, in which the pivoting end is pivoted at the second end and the free end hangs down under the pivoting end due to gravity. When the free end of the blocking member leans against on the object on the rail, the object applies a counterforce onto the blocking member so as to drive the first end of the linkage member to move towards the buffering space. The invention also discloses a multi-function printer.