However, such materials have no effect on the growth of microorganisms during water storage. Indeed, they eventually lose their water purification effects because they themselves become a breeding ground for microbial growth. An antibacterial complex composed of silver and carbon (Ag/C) was recently shown to provide good bactericidal action against _Bacillus subtilis_ and _Escherichia coli_[6]. However, the antibacterial effect was not obvious, due to the weak bond between carbon and silver. When the content of Fe\({}_{3}\)O\({}_{4}\) and straw is increased, a straw/Fe\({}_{3}\)O\({}_{4}\)/polycaprolactone complex has also shown strong antibacterial ability [7], but it cannot be directly applied to a terminal drinking water device. Membrane filtration mainly involves the interception of larger particles and adsorbents in terminal water, but the membrane itself does not kill microorganisms. [PERSON] et al. [8] reported a multifunctional system for high-efficiency water treatment that combines traditional pressure-driven membrane filtration with solar thermal technology based on a photothermal membrane. [PERSON] et al. [5] described a mesoporous, three-dimensional (3D) wood membrane decorated with palladium nanoparticles for efficient water treatment. Organic, biocompatible membranes were used to remove heavy metal ions and dyes such as lead and cadmium by [PERSON] et al. [9]. However, most membrane materials only remove micro-contaminants and intercept large particles [5]. There are often bacterial contaminants in drinking water [1], and the eradication of these harmful bacteria has been neglected. Although [PERSON] et al. [10] reported that a chitosan/polyvinyl alcohol/TiO\({}_{2}\)/Ag coating for a drinking water tank had an antibacterial effect, it had no filtering effect. To permit water to be drunk directly from the terminal, it is necessary to intercept and kill bacterial microorganisms. Development of a bacteriostatic filtration membrane that is highly efficient, long-lasting, and harmless to human health is therefore an urgent necessity. Here, we describe a polyvinyl alcohol/bacterial cellulose/nanosilver-loaded biochar (PVA/BC/C-Ag) composite membrane with good antibacterial properties that can be synthesized using a simple method. PVA is used in many industries because the crosslinked polyvinyl alcohol gel has good biocompatibility, excellent mechanical properties [11; 12], and a 3D network structure. However, by itself, PVA is prone to swelling and rupture when it encounters water. Bacterial cellulose has a fine 3D network structure, high tensile strength, biodegradability, and biocompatibility [13; 14]; it is used in many fields, including the healthcare and cosmetics industries [15]. BC is also widely used because it enhances the mechanical strength of other materials when it is added to a composite [16]. Mixing PVA and BC can therefore improve the mechanical performance of the PVA membrane. Silver is widely used in antibacterial composite membranes because of its broad-spectrum bactericidal action and durability. However, excess silver ions in drinking water can also endanger human health. When corn stalk biochar is combined with silver nanoparticles, the resulting material has good coating properties and silver ion release characteristics [17; 18]. In the present work, we used silver as a bacteriostatic additive to prepare silver-loaded biochar (C-Ag) by impregnation and high-temperature carbonization reduction. We predicted that the combination of carbon and silver would produce strong, long-lasting antibacterial properties and that the addition of carbon would affect the performance of a composite membrane. We synthesized an antibacterial PVA/BC/C-Ag composite membrane with a fine 3D network structure and characterized its mechanical properties by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), scanning electron microscopy (SEM), and thermogravimetric differential scanning calorimetry (TG-DSC).