The invention relates to the technical field of bridge construction, in particular to a box girder end part structure convenient to mount a pier and a box girder pier mounting method. The box girder end part structure comprises a box girder and a nose girder; the nose girder is a guiding structure fixed to the lower end surface of box girder end part and higher than the lower end surface of the box girder, and the box girder end part structure is characterized in that the box girder end part structure further comprises a temporary support structure movably connected to the box girder end part;the temporary support structure is a temporary support capable of being packed on the box girder end part, the temporary support structure can be unfolded from the box girder end part and support ona pier column when moving from the box girder end part to close to the pier column, and the lower end surface of the temporary support structure is aligned to the lower end surface of the box girder when the temporary support structure is unfolded. According to the box girder end part structure convenient to mount the pier, the temporary support structure is mounted on the box girder end part, a front guiding structure of box girder pier mounting is formed before box girder pier mounting, fast pier mounting of the box girder is convenient, the whole temporary support structure is simple, operation is convenient, reuse can be achieved, the technology process of pier mounting is simplified, and the box girder end part structure convenient to mount the pier has great promotional value.