The utility model discloses a uniform-pressure wind room for a medium speed coal mill. The uniform-pressure wind room for the medium speed coal mill comprises an arc-shaped flow equalizing piece arranged at the inner side of the outer side wall of a wind chamber, and thickness of the flow equalizing piece is changed along the circumferential direction of the outer side wall of the wind chamber; the closer a part of the arc-shaped flow equalizing piece becomes to an air inlet of a machine case of the wind chamber in the peripheral direction, the thinner the part of the arc-shaped flow equalizing piece is; a cone-shaped body is formed at a position, close to a millstone along the axial direction, of the arc-shaped flow equalizing piece, and the closer the cone-shaped body becomes to the millstone, the thinner the cone-shaped body is; and a cylinder is formed at a position, far away from the millstone along the axial direction, of the arc-shaped flow equalizing piece. The uniform-pressure wind room for the medium speed coal mill has the advantages that the arc-shaped flow equalizing piece is welded at the inner side of the outer side wall of the wind chamber, width (or thickness) of the flow-equalizing piece is changed along the circumference, and uniform-pressure design in the wind chamber is realized.