The invention provides a voltage and current compatible type speed signal acquisition circuit and belongs to the electronic field. The speed signal acquisition circuit includes a voltage signal type speed sensor sampling loop and a current signal type speed sensor sampling loop; the voltage signal speed type sensor sampling loop includes a resistor R1, a resistor R2, a resistor R9 and a triode VT1; the current signal type sensor sampling loop includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10 and a resistor R11 as well as a triode VT2, a triode VT3 and a triode VT4; the resistor R7, the resistor R8, the resistor R9 and the resistor R10 from a speed signal voltage division circuit; and the resistor R7, the resistor R8 and the triode VT4 form an over current protection circuit. According to the voltage and current compatible type speed signal acquisition circuit of the invention, a voltage signal type speed sensor and a current signal type speed sensor are utilized, so that the voltage and current compatible type speed signal acquisition circuit can be formed, and the flexibility and operability of a system can be significantly improved. The reliability of the speed signal acquisition circuit is enhanced and has a high practical value.