Rainproof writing board

The invention relates to a rainproof writing board. The rainproof writing board comprises a fixing substrate, a supporting plate and rainproof baffles, wherein the fixing substrate is used for fixingrecord files and is provided with an accommodating part; the supporting plate is slidably accommodated inside the accommodating part or extends out of the accommodating part; the supporting plate is rotationally connected with the fixing substrate; the rainproof baffles are rotationally connected with the supporting plate; when the supporting plate extends out of the accommodating part, the rainproof baffles can be positioned at an interval over the record files for shielding the record files in a manner of being opposite to one another. Thus, the rainproof baffles can shield the record filesinstalled on the fixing substrate so that the problem that the recorded characters are dim or even the paper is broken and cannot be used because the record files are wetted by rain and snow is prevented; the efficiency and qu