The invention provides a learning management device, which is characterized by comprising a central server, a plurality of learning terminals and a plurality of query terminals, wherein the central server consists of a knowledge storage part, a student information storage part, a center-side communication part, a retrieval acquiring part, a center-side control part, an online duration calculation part, a temporary storage part, a total duration calculation part, a student number calculation part, an average duration calculation part, a duration information storage part, a retrieval judging part and a query information acquiring part; the plurality of learning terminals for students to use are each in communication connection with the central server, and each learning terminal comprises a learning-side picture storage part, a learning-side input displaying part, a learning-side communication part, a time acquiring part and a learning duration acquiring part; and the plurality of query terminals for teachers to use are each in communication connection with the central server, and each query terminal comprises a query-side picture storage part, a query-side input displaying part and a query-side communication part.