The invention discloses a production method and a production line of a glass envelope of a bathroom heater lamp. The production method comprises mixture making, melting down, homogenizing in a material channel, feeding by a material basin, material cutting, cake of press, frothing shaping and fritter removing annealing. The production line comprises a mixer, a feeding mechanism, a melting furnace, the material channel, the material basin, a feeder machine, a bubbling machine, a conveyer belt and an annealing furnace, wherein the feeding mechanism is arranged between the mixer and the melting furnace, the material channel is a closed material channel, and the bottom of the material channel is provided with a draining device. The invention enables the consistency of technologic indexes of products to be greatly enhanced and to outstrip 95 percent, has steady production, and reduces quality defects of the products and errors of manual operation by adopting production of machinery.