The present application relates to a stencil printing machine, which comprises a first holder device (110), a mobile device (121), two support tables (131, 132) and two driving devices (151, 152), wherein the first holder device (110) is configured to be able to horizontally reciprocate in the portrait orientation, the mobile device (121) is mounted on the first holder device (110) and is configured to be able to horizontally reciprocate in the landscape orientation on the first holder device (110), the two support tables (131, 132) are mounted at the lower end of the mobile device (121) and are used to bear corresponding solder paste jars (141, 142), the two driving devices (151, 152) are mounted on the mobile device (121) so that each of the two driving devices (151, 152) is located above a corresponding support table (131, 132) and is used to press a corresponding solder paste jar (141, 142), and the mobile device (121) is configured to be able to drive the two support tables (131, 132) and the two driving devices (151, 152) to reciprocate vertically. Two standard solder paste jars (141, 142) can be assembled for the stencil printing machine provided by the present application. When one solder paste jar (141, 142) is empty, solder paste supply is switched to the other solder paste jar (141, 142) and the stencil printing machine can continue to operate without stopping, thus improving the working efficiency of the stencil printing machine significantly.