The utility model discloses a portable farmland membrane covering device, including action bars, first connector, location clamp, walking wheel, tectorial membrane pole, second connector, supplementary telescopic bracket, the lower extreme of action bars be provided with the walking wheel, one side of first connector be provided with the location clamp, location clamp cover locate the action bars on, make the location clamp can adjust the position of first connector on the action bars, one end and the first connector of tectorial membrane pole articulated, the other end concreties with the second connector, supplementary telescopic bracket's one end and second connector articulated. The utility model discloses can fold, the advantage that has portable, transport, place after folding, use in the farmland that is fit for different relief conditions, and application scope is wide, furthermore, the utility model discloses can adjust the height of tectorial membrane pole to can be to the high tectorial membrane in different ridges, the utility model discloses simple structure, operation convenient to use, it saves labour to save time, effectively reduces workman intensity of labour.