The invention relates to a motor positive and negative rotation control circuit, comprising a contactor KM, a contactor KM1, a contactor KM2, a contactor KM3, a time relay KT1, a time relay KT2, a positive rotation switch SB3 and a negative rotation switch SB2. When a motor is switched into a negative direction from a positive direction or switched into a positive direction from a negative direction, on one hand, after a main contact KM1-1 of the contactor KM1 or a main contact KM2-1 of the contactor KM2 is completely subjected to arc extinction, the main contact KM2-1 of the contactor KM2 or the main contact KM1-1 of the contactor KM1 is closed under the condition that a main circuit is disconnected, so that the effect is played in protecting the main contact KM1-1 and the main contact KM2-1, and the interphase short circuit in the direction switching process is prevented; on the other hand, enough time is reserved for the motor being subjected to power failure for enabling that the speed of the motor is gradually reduced, so that the risks of damage of the motor and a transmission device are reduced; due to the arrangement of the contactor KM3 which is connected between two phases of a power supply in the main circuit, phase-lack protection can be provided.