The invention provides solid cardanol. The component of the solid cardanol is cardanol of which the side chain is saturated. The preparation method for the solid cardanol comprises the following steps: putting the cardanol or cashew nut oil into an autoclave, adding catalyst into the autoclave, firstly introducing a protective gas to exhaust air in the autoclave, then introducing hydrogen, and stirring for reaction for 3 to 6 hours at a temperature of between 100 and 200 DEG C and atmospheric pressure of between 1 and 5 MPa; and after the reaction is finished, collecting the product, then decompressing and distilling the product, and cooling the distillate to obtain the solid cardanol. The solid cardanol has the following advantages that the side chain of the solid cardanol is saturated, so the side chain does not generate self-gathering during fine purification at high temperature or high temperature treatment process for synthesizing other products; the solid cardanol is not easily oxidized nor lost by self-gathering during storage and transportation; and the solid cardanol does not generate self-gathering during fine purification of decompression and distillation, so the yield of the solid cardanol is improved.