A low-temperature container comprising: a housing comprising a cylindrical housing body and two outer sealing heads at both ends of the housing body respectively; and an inner container disposed inside the housing through a support assembly and comprising a cylindrical inner container body and two inner sealing heads at both ends of the inner container body respectively; wherein, the support assembly comprises: two transverse support structures correspondingly disposed in an interlayer between the housing body and the inner container body; and two longitudinal support structures respectively disposed between the outer sealing head and the inner sealing head located at ends, wherein central lines of the two longitudinal support structures and a central axis of the inner container are collinear, or the central lines of the two longitudinal support structures are parallel to the central axis of the inner container, and wherein the longitudinal support structures may extend and retract in the longitudinal direction of the low-temperature container, characterized in that each of the transverse support structures comprises a housing support part fixed to an inner wall of the housing body, an inner container support part fixed to an outer wall of the inner container body and corresponding to the housing support part, a support ring fixed to the housing support part at one end and extending to the inner container support part at the other end and a heat shield block disposed between the inner container support part and the support ring; wherein the inner container support part comprises a bowl-shaped fix plate having a bottom wall and a side wall bending and extending from the bottom wall to one side; the side wall of the fix plate is fixed to the inner container body, and the bottom wall is embedded into the inner container; the bottom wall and side wall encompass a receiving space into which the support ring extends; and a gap exists between the support ring and the bottom wall of the fix plate. a housing comprising a cylindrical housing body and two outer sealing heads at both ends of the housing body respectively; and an inner container disposed inside the housing through a support assembly and comprising a cylindrical inner container body and two inner sealing heads at both ends of the inner container body respectively; wherein, the support assembly comprises: two transverse support structures correspondingly disposed in an interlayer between the housing body and the inner container body; and two longitudinal support structures respectively disposed between the outer sealing head and the inner sealing head located at ends, wherein central lines of the two longitudinal support structures and a central axis of the inner container are collinear, or the central lines of the two longitudinal support structures are parallel to the central axis of the inner container, and wherein the longitudinal support structures may extend and retract in the longitudinal direction of the low-temperature container, characterized in that each of the transverse support structures comprises a housing support part fixed to an inner wall of the housing body, an inner container support part fixed to an outer wall of the inner container body and corresponding to the housing support part, a support ring fixed to the housing support part at one end and extending to the inner container support part at the other end and a heat shield block disposed between the inner container support part and the support ring; wherein the inner container support part comprises a bowl-shaped fix plate having a bottom wall and a side wall bending and extending from the bottom wall to one side; the side wall of the fix plate is fixed to the inner container body, and the bottom wall is embedded into the inner container; the bottom wall and side wall encompass a receiving space into which the support ring extends; and a gap exists between the support ring and the bottom wall of the fix plate. two transverse support structures correspondingly disposed in an interlayer between the housing body and the inner container body; and two longitudinal support structures respectively disposed between the outer sealing head and the inner sealing head located at ends, wherein central lines of the two longitudinal support structures and a central axis of the inner container are collinear, or the central lines of the two longitudinal support structures are parallel to the central axis of the inner container, and wherein the longitudinal support structures may extend and retract in the longitudinal direction of the low-temperature container, characterized in that each of the transverse support structures comprises a housing support part fixed to an inner wall of the housing body, an inner container support part fixed to an outer wall of the inner container body and corresponding to the housing support part, a support ring fixed to the housing support part at one end and extending to the inner container support part at the other end and a heat shield block disposed between the inner container support part and the support ring; wherein the inner container support part comprises a bowl-shaped fix plate having a bottom wall and a side wall bending and extending from the bottom wall to one side; the side wall of the fix plate is fixed to the inner container body, and the bottom wall is embedded into the inner container; the bottom wall and side wall encompass a receiving space into which the support ring extends; and a gap exists between the support ring and the bottom wall of the fix plate.