Variable displacement vane pump capable of avoiding pressure drop during temperature rise

The invention relates to the technical field of oil pumps, in particular to a variable displacement vane pump capable of avoiding pressure drop during temperature rise. The variable displacement vanepump comprises a pump body, a pump cover, a pump shaft, a rotor, a sliding block and a spring; the front side of the sliding block is connected with the inner wall of the pump body through a rotary pin, and the rear side of the sliding block is provided with a sliding block arm abutting against the inner wall of the pump body; a feedback cavity is formed in the right side of the sliding block, andan oil cavity communicating with a main oil channel is formed in the left side of the sliding block; the two ends of the spring abut against the left side of the sliding block arm and the inner wallof the pump body respectively; and an oil guiding groove used for guiding oil leaked from the end face of the sliding block to return into the oil cavity is formed in the upper end face of the slidingblock. According to the var