The invention discloses an automatic drying oven for mushrooms. The automatic drying oven is characterized by being provided with a square box body, wherein the box body is of a sandwich structure; an outer layer is made of a thermal insulating material; an inner layer is made of iron sheets; a heating wire is arranged in the interlayer of the box body; a drying oven door is arranged on one side of the box body; a power distribution control cabinet is arranged on the upper part of one side of the box body; an air inlet is arranged at the top of the interlayer on one side of the box body; an air outlet is arranged at the top of the box body; a supporting base is arranged at the bottom of the box body; from bottom to top, a plurality of barrier strips are sequentially and horizontally arranged on the iron sheets on the left and right sides relative to the drying oven door in the box body; and corresponding barrier strips on the iron sheets on left and right sides of the box body are in a same horizontal plane. By adopting the technical scheme of the invention, compared with the prior art, the automatic drying oven has the advantages of short drying time, small noise, low power consumption, environmental friendliness, low pollution, better color and shape of the mushrooms after being dried, and manpower and material resources saving.