The invention provides a thermogravimetric apparatus for measuring volatile and easily condensed products in products. The apparatus comprises a balance (1), a collecting cup (2), a heating furnace (3), an elevating device (4), a data processing system (5) and a gas circuit system (6), wherein the balance is used for measuring mass variation and comprises an upper end micro balance and a lower end micro balance; the lower end of the upper end micro balance is connected with a volatile matter condensing and collecting cup by a hanging hook and used for measuring the mass variation of the volatile and easily condensed products generated in the reaction; the lower end micro balance is connected with a crucible for placing samples through a reactant supporting rod and is used for measuring mass variation of the reactant; and the collecting cup completely covers the crucible for filling the reactant and has an effect of preventing volatile matters generated in the reaction from being condensed on a furnace tube. Through the adoption of the thermogravimetric apparatus provided by the invention, a difficult problem that the traditional thermogravimetric equipment cannot measure the samples of the volatile and easily condensed products generated in the reaction process; moreover, the mass variations of the samples and the volatile matters can be simultaneously measured, so that the thermogravimetric equipment obtains wider applicability.