The invention discloses a preparation device and a preparation technology for solid automobile urea. The device mainly comprises a urea synthesis tower, a preliminary flash evaporation separator, a medium-pressure stripping tower, a low-pressure stripping tower, a medium-pressure preheating reactor, a flash evaporation heating separator, a heat energy preheater, a primary evaporation heating separator, a secondary evaporation heating separator, a urea melting pump, a granulating tower, a cooler and an absorption tower. The solid automobile urea prepared by the preparation device and the preparation technology for solid automobile urea has greatly improved transportation capability and safety, and has a much higher sale price for ordinary urea to achieve considerable profit.