The invention discloses a determination method for the solid content of a polymer cement waterproof paint used for a furniture factory building. The determination method comprises the following steps: putting a culture dish with a diameter of 75 to 80 mm and an edge height of 8 to 10 mm in a drying box for drying at 105 DEG C +/- 2 DEG C for 30 min, then taking the culture dish out, putting the culture dish into a drier with variable-color silica gel or anhydrous calcium chloride, carrying out cooling to room temperature and then weighing the culture dish; uniform mixing a polymer cement waterproof paint sample under stirring, weighing a certain amount of the sample, putting the weighed sample into the weighed culture dish, allowing the sample to uniformly distributed on the bottom of the culture dish through flowing, drying the culture dish in the drying box for drying at 105 DEG C +/- 2 DEG C for 1 h, taking the culture dish out, cooling the culture dish in the drier to room temperature, then weighing the culture dish, putting the culture dish into the drying box for drying for 30 min, then drying the culture dish the drier to room temperature, then carrying out weighing, and repeating the above operations until difference of two adjacent weighing operations is no more than 0.01 g; and calculating results. The method can accurately determine the solid content of the polymer cement waterproof paint, is high in efficiency and allows the subsequently produced paint to have stable quality and to reach predetermined requirements.