The invention discloses a sand sieving device for civil engineering. The sand sieving device comprises a box body, a feeding hopper, a feeding channel, a pulverizing device, a sand sliding plate, a first spring, a sand and gravel rotating fan, a first sieve net, a second sieve net, a second spring, a third motor, a disc, a moving rod, a cross rod, a vertical rod and a hitting ball, wherein the pulverizing device comprises a first motor, a stirring shaft and a pulverizing rod; and the sand and gravel rotating fan comprises a second motor, a mounting shaft, a fan plate and a hot air blower. By arranging the pulverizing device, caking sand and gravel are pulverized, and insufficient sieving is avoided; by arranging the sand and gravel rotating fan, insufficient sieving caused by too-high sandfalling speed is avoided, and at the same time, the sand and gravel are dried, so that the blocking of sieve net holes by the wet sand and gravel and the influence of engineering use are avoided; byarranging the first sieve net, the second sieve net, the third motor, the disc, the moving rod, the cross rod and the hitting ball, multi-stage sieving can be carried out; and by driving the first sieve net and the second sieve net to swing upwards and downwards through cooperation, the sieving efficiency is increased.