The invention relates to a multifunctional platform frame for a rickshaw, which comprises a rickshaw crossbeam, pedals, a rickshaw saddle and a motive power transmission device and is characterized in that the front end of the rickshaw crossbeam is hinged with a connecting mechanism assembly, the back end of the rickshaw crossbeam is fixedly connected with a through shaft bracket for forming a rickshaw frame platform frame, the through shaft bracket is a horizontal framework provided with a through shaft in the middle, the back end of the through shaft bracket is provided with a back bracket,the rickshaw saddle, a rickshaw saddle support frame and pedal shafts of the pedals are arranged on the rickshaw crossbeam, the motive power transmission device adopts two-stage chain transmission, the first-stage chain transmission is formed by a large chain wheel and a small driven fly wheel through a chain, the second-stage chain transmission is formed by a driving chain wheel and a coaxial chain wheel of a back wheel of a back rickshaw carriage through a chain, the large chain wheel is fixedly connected with the pedal shafts, and the small driven fly wheel and the second-stage chain transmission driving chain wheel are respectively arranged on the through shaft. The multifunctional platform frame has the advantages that the applicability is good, the use range of the platform frame iswidened, the rickshaw bump problem is solved, the safety and the stability are high, the problem of easy turning at sudden turning is solved, the occurrence of accidents is avoided, and the service life of vehicles is also prolonged.