The invention relates to a vehicle attitude detecting device, in particular to a vehicle running attitude detecting device, more particularly to a slide-changing resistance type vehicle attitude detecting device comprising an eccentric wheel type slide-changing resistor, an A/D conversion measuring circuit connected in parallel with the eccentric wheel type slide-changing resistor, a data processing module, a power module and a trigger module, wherein the power module supplies power; the trigger module controls the power module; the A/D conversion measuring circuit measures the variable voltage value of the eccentric wheel type slide-changing resistor and converts the variable voltage value into a voltage digital signal; and the data processing module receives the voltage digital signal output by the A/D conversion measuring circuit. The inclination of a vehicle is obtained according to the relation between the voltage value and the effective resistance of a resistance ring of the eccentric wheel type slide-changing resistor and the relation between the effective resistance of the resistance ring and the deflection angle of an eccentric wheel. The invention can accurately measure the attitude of the vehicle and has the characteristic of low cost.