The invention discloses a device for measuring gas permeation in coal. The device comprises a sample container body (1), a front container cover (2) and a rear container cover (3); one end of the sample container body (1) is a sample placing hole (26), the other end of the sample container body (1) is a gas channel (27), the diameter of the sample placing hole (26) is larger than that of the gas channel (27), the sample placing hole (26) is communicated with the gas channel (27) and is internally provided with inner threads, the front container cover (2) comprises a front container cover body(28), a sample end (29) and a connection end (30), a channel is arranged among the front container cover body (28), the sample end (29) and the connection end (30), the sample end (29) is provided with outer threads and being used for connection with the inner threads of the sample placing hole (26), a channel is arranged in the middle of the rear container cover (3), and the sample container body (1) is respectively connected with the front container cover (2) and the rear container cover (3) in a sealing way. The device disclosed by the invention has the advantages of simple structure, easiness for operation, reliability and safety in sealing, high measuring precision and automation in measurement.