In this letter, we have reported experimental observation of diverse structural multimode (MM) soliton molecules in an all fiber spatiotemporal mode-locked (STML) laser. By adjusting the intracavity devices, the STML operation state at ∼1560 nm with the identical soliton separation is achieved, including soliton triplet, soliton quartet, and soliton quintet. Additionally, the STML soliton molecule with compound structure can also be obtained, where two different pulse separations exist in the soliton molecule complex, for the inner soliton with the unequal or identical intensity. The transverse mode distributions for different soliton molecule complexes differ from each other, indicating the STML structure of the MM solitons. Our experimental results will extend our further understanding of the spatiotemporal nonlinear dynamics in the MM lasers.