Five treatments were designed to investigate the effects of different mixing methods on the mixing uniformity of porous clay ceramic (PLC) and soil, including conventional mixing method + air-dried PLC(CK), conventional mixing method + water-immersed PLC(1T), conventional mixing method + mud-state PLC(2T), layered mixing method + air-dried PLC(3T) and layered mixing method + water-immersed PLC(4T). And the mixing uniformity is characterized by the standard deviation and variation coefficient of bulk density. The results showed that the form of PLC significantly affected the mixing uniformity. When conventional mixing was used, the water-immersed PLC significantly increased the mixing uniformity of 0-10 cm and 0-20 cm soil layers, and the standard deviation of bulk density was reduced by 188% and 105%, respectively, compared with the air-dried PLC; the variation coefficient of bulk density was reduced by 62.1% and 50.1%, respectively. The muddy PLC not only significantly reduced the uniformity of different soil layers mixed with PLC and soil, but also significantly increased the difference in mixing uniformity between 0-10 cm and 10-20 cm soil layers. The standard deviation and variation coefficient of bulk density in 0-10 cm soil layers were 68.1% and 50.8% significantly higher than 10-20 cm. Univariate analysis showed that the mixing method had no significant effect on the mixing uniformity, and there was no interaction between the mixing method and the forms of PLC. However, the form of PLC was the main factor affecting the mixing uniformity of PLC and soil. The use of water-immersed PLC mixed with the soil in a conventional mixing method not only improved the mixing uniformity of the whole mixture and different soil layers, but also reduced the difference in mixing uniformity between different layers, therefore, it is recommended for mixing soil and PLC.