In Tianjin， construction waste mud is disposed in a simple way with serious environment pollution； thus， posing a construction difficulty which needs to be solved urgently. Taking a pile foundation construction site as the test site， the physical pressure filtration treatment test of waste slurry on site was carried out by using a small filter press， where the Type 1 press cloth of 28~30L/（m²·s） was selected with 60min as the optimal treatment time for a single press to achieve solid-liquid separation of waste mud on site. In actual operation of the construction equipment， the single pressure filtration time can be reduced to 45min by adding a small amount of lime. The on-site pressure filtration method solves the problem of on-site mud discharge effectively， and achieves the purpose of resource saving and environmental protection.