The invention discloses a riding and standing type motor vehicle capable of changing speed and direction according to human standing postures. The riding and standing type motor vehicle comprises a front driving bottom plate, a rear driving bottom plate and a middle driving bottom plate. Two ends of the rear driving bottom plate are provided with first connection ports, a first driving shaft is arranged in the first connection ports, traveling wheels and transmission gear ports are arranged at two ends of the first driving shaft, and the transmission gear ports are connected with a power unit.A carrier, a control device, a turning angle determination device and a variable-speed control device are arranged on the middle driving bottom plate. The front driving bottom plate is provided witha steering groove and second connection ports, a steering shaft is arranged in the second connection ports and provided with steering wheels and steering gear ports, and sensing units are arranged onsteering rotors which are arranged on the turning angle determination device. By adoption of a novel mechanical structure, the motor vehicle is capable of changing speed and direction according to postures of a driver and passengers, and accordingly the service performance of the motor vehicle is greatly improved, high safety in use is achieved, and practical utilization requirements are met.