The invention provides a domestic plant seed germination machine, which can automatically keep enough moisture of plant seeds without using a water pump and spraying water and also enables the plant seeds to breathe. A container with the plant seeds is hoisted above the horizontal plane of a water container by a pull rope, and the container with the plant seeds is descended into water at fixed time and then is raised; then the water flows out from the seed container; and the seeds can breathe air and are germinated. One end of the pull rod is fixed on a rope winding shaft; and the rope winding shaft rotates to drive the container with the plant seeds to raise or descend. The rope winding shaft is driven by a motor of a worm wheel and worm rod speed reducer; and the container with the plant seeds is stably positioned through utilizing a self-locking function of the worm wheel and worm rod speed reducer. The pull rope drives the container with the plant seeds through a movable pulley wheel. The motor, the worm wheel and worm rod speed reducer and the rope winding shaft are arranged in an electric appliance shell; and a light touch switch is arranged at the bottom of the electric appliance shell.