▎ 摘　　要

NOVELTY - Antibacterial plastic comprises carbon nitride (C3N4) or its composite and thermoplastic plastic in the mass ratio of 0.01-5:100, respectively. USE - The antibacterial plastic, which is useful in preparing antibacterial plastic product e.g. medical antibacterial materials. ADVANTAGE - The antibacterial plastic has a good antibacterial effect under the condition of no illumination, the antibacterial rate of the antibacterial plastic against Escherichia coliand Staphylococcus aureusis greater than 99.99%, avoids the metal pollution, has light weight, stable chemical property, good impact resistance, high transparency and abrasion resistance, good thermal insulating property, low thermal conductivity, good forming property, and good coloring property. The method has simple preparation, and low processing cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing antibacterial plastics comprising proportioning C3N4 or its compound and thermoplastics, uniformly mixing the C3N4 or its compound with the thermoplastic to obtain a mixture; and heating and melting the mixture; and an antibacterial plastic product comprising the antibacterial plastic through a plastic processing process.