The invention relates to the field of road construction, especially a diatomite modified asphalt mixture pavement and a construction process thereof. The invention discloses a diatomite modified asphalt mixture pavement. The diatomite modified asphalt mixture pavement is characterized in that: the diatomite modified asphalt mixture pavement comprises, by weight, 4-5 parts of asphalt and diatomite, 95-96 parts of aggregate, wherein a weight of the diatomite is 12-15% of the total weight of the asphalt and the diatomite. The construction process for the diatomite modified asphalt mixture pavement comprises steps of: preparing construction, paving experimental road, cleaning lower layer (base course), spraying priming oil (bonding oil), mixing the diatomite modified asphalt mixture, transporting the mixture, paving the mixture through a paver, rolling into the shape, carrying out detecting, and finally cooling the pavement to open traffic. With the present invention, pavement performanceof the asphalt mixture can be effectively improved, durability and rut resistance of the asphalt mixture pavement are increased, the construction process is simple and easy to be operated, and cost of the pavement is low.