An organic electroluminescent device, comprising: an anode, a cathode, and a light-emitting layer disposed between the anode and the cathode, a host material of the light-emitting layer comprising a donor host material and a acceptor host material, the donor host material and the acceptor host material forming an exciplex, the host material being doped with a guest material; wherein a molecular formula of the donor host material is: wherein Ar 1, Ar 2, Ar 3 and Ar 4 substituents are same or different, and are independently selected from an arylene group or a heteroarylene group; and structures of R 1, R 2, R 3 and R 4 are wherein Ar 5, A, Ar 6, B and Ar 7 are connected in a fused ring manner, sharing two atoms, Ar 5, Ar 6 and Ar 7 are the same or different, are independently selected from a benzene ring, a substituted benzene ring, a naphthalene ring, a substituted naphthalene ring, an anthracene ring or a substituted anthracene ring, A is a five-membered heterocyclic ring or a six-membered heterocyclic ring containing nitrogen atoms, and B is a five-membered ring, a five-membered heterocyclic ring, a six-membered ring or a six-membered heterocyclic ring; and/or, a molecular formula of the acceptor host material is: wherein X 1 and X 2 are same or different, and are -CH- or -N- respectively; Y is -O-, -S-, -Se-, -C(CH 3) 2 -, -C(C 6 H 5) 2 - or -C(9-fluorenyl)-; Ar 8 and Ar 9 substituents are the same or different, and are independently selected from an arylene group or a heteroarylene group; and structures of R 5 and R 6 are wherein Ar 10, C ring, Art 11, D ring and Ar 12, are connected in a fused ring manner, sharing two atoms, and Ar 10, Ar 11 and Ar 12 are the same or different, and are independently selected from a benzene ring, a substituted benzene ring, a naphthalene ring or a substituted naphthalene ring, C ring is a five-membered heterocyclic ring or a six-membered heterocyclic ring containing nitrogen atoms, and D ring is a five-membered ring, a five-membered heterocyclic ring, a six-membered ring or a six-membered heterocyclic ring. an anode, a cathode, and a light-emitting layer disposed between the anode and the cathode, a host material of the light-emitting layer comprising a donor host material and a acceptor host material, the donor host material and the acceptor host material forming an exciplex, the host material being doped with a guest material; wherein a molecular formula of the donor host material is: wherein Ar 1, Ar 2, Ar 3 and Ar 4 substituents are same or different, and are independently selected from an arylene group or a heteroarylene group; and structures of R 1, R 2, R 3 and R 4 are wherein Ar 5, A, Ar 6, B and Ar 7 are connected in a fused ring manner, sharing two atoms, Ar 5, Ar 6 and Ar 7 are the same or different, are independently selected from a benzene ring, a substituted benzene ring, a naphthalene ring, a substituted naphthalene ring, an anthracene ring or a substituted anthracene ring, A is a five-membered heterocyclic ring or a six-membered heterocyclic ring containing nitrogen atoms, and B is a five-membered ring, a five-membered heterocyclic ring, a six-membered ring or a six-membered heterocyclic ring; and/or, a molecular formula of the acceptor host material is: wherein X 1 and X 2 are same or different, and are -CH- or -N- respectively; Y is -O-, -S-, -Se-, -C(CH 3) 2 -, -C(C 6 H 5) 2 - or -C(9-fluorenyl)-; Ar 8 and Ar 9 substituents are the same or different, and are independently selected from an arylene group or a heteroarylene group; and structures of R 5 and R 6 are wherein Ar 10, C ring, Art 11, D ring and Ar 12, are connected in a fused ring manner, sharing two atoms, and Ar 10, Ar 11 and Ar 12 are the same or different, and are independently selected from a benzene ring, a substituted benzene ring, a naphthalene ring or a substituted naphthalene ring, C ring is a five-membered heterocyclic ring or a six-membered heterocyclic ring containing nitrogen atoms, and D ring is a five-membered ring, a five-membered heterocyclic ring, a six-membered ring or a six-membered heterocyclic ring.