The invention relates to a portable sputum collector, comprising an outer container and an inner container, the inner container can be accommodated in the outer container, the outer container is provided with a laterally opened side cover of the outer container, a spitting port is opened on the upper part of the outer container and The top of the inner container is provided with a top cover of the inner container; a liquid injection pipe is fixedly connected to the collector through the wall of the outer container, and its liquid inlet is arranged on the outside of the collector, and the liquid outlet is arranged on the outside of the collector. inside of the collector. The sputum collector is simple and lightweight, can be taken at hand, has multiple airtight immediate disinfection functions, can effectively reduce the secondary pollution of sputum to the ward environment, and reduce the risk of cross-infection of patients' family members, patients or staff. It solves the difficult problem of collecting sputum from patients, and has very high clinical use value.