The invention discloses a tunnel construction environment monitoring method. The tunnel construction environment monitoring method comprises the following steps that (1) sensors for measuring concentration of tunnel environmental pollutants are arranged in a tunnel at certain intervals; (2) cloud images of distribution of the pollutants in a tunnel model under various different set concentrationsby using fluent software are simulated, concentration data of points corresponding to positions of the arranged sensors in the tunnel are extracted from the cloud images, and the cloud images and theconcentration data of all the points extracted from the cloud images are stored in a database; and (3) a monitoring host reads detection data of the sensors every other a set detection cycle, searchesthe cloud images of the distribution of corresponding pollutants in the database according to the detection data of the sensors, and displays the searched cloud images and the detection data of the sensors through a displayer. According to the tunnel construction environment monitoring method, managers can know the pollutant concentration conditions at different positions in the whole tunnel areathrough the searched corresponding cloud images by establishing a cloud image database of the distribution of the pollutants in the tunnel.