Multi-transmission universal joint

The invention relates to a multi-transmission universal joint and belongs to the field of mechanical transmission. The universal joint is composed of an inner universal joint body and N outer universal joint bodies arranged on the outer side of the inner universal joint body in a sleeving mode layer by layer. N is a natural number larger than or equal to one. The inner universal joint body is composed of an inner universal joint input shaft, a connection piece and an inner universal joint output shaft. The outer universal joint bodies are annular cardan joints. Each outer universal joint body is composed of an outer universal joint input shaft, an annular universal joint pin and an outer universal joint output shaft. The universal joint has the advantages that the structure is novel, the universal joint is formed by arranging the universal joint bodies in a sleeving mode layer by layer from inside to outside, each universal joint input shaft and each universal joint output shaft are arranged on the universal input shaft and the universal output shaft on the inner side in a sleeving mode from inside to outside respectively, different rotation directions or rotation speeds of multiple pairs of transmission shafts arranged in a sleeving mode in the same axial direction can be transmitted at the same time, requirements for space are reduced, and the mechanism is simplified.