The invention provides a paper mill wastewater treatment technology which includes the following steps of A, paper mill wastewater primary filtering, B, paper mill wastewater suspended matter processing, C, gas floating mud processing, D, filtered water organic matter processing and E tiny impurity and sand refiltering. Paper mill wastewater treatment equipment comprises a first liquid containing pool. A paper mill wastewater primary treatment device is fixedly arranged above the first liquid containing pool. One side of the first liquid containing pool is fixedly provided with a paper mill wastewater gas floating treatment device. The side of the paper mill wastewater gas floating treatment device is fixedly provided with a gas floating mud filtering device. The side of the gas floating mud filtering device is fixedly provided with a filtered water organic matter treatment device. The side of the filtered water organic matter treatment device is fixedly provided with an impurity refiltering device. By means of the paper mill wastewater treatment technology and the treatment equipment thereof, a great amount of suspended matter, mud, organic matter and other pollutants in paper mill wastewater can be efficiently processed with a low cost so that the processed wastewater can be industrially used again, the environment is protected, enterprise benefits are high, and the paper mill wastewater treatment technology and the treatment equipment are worthy of application and popularization.