The invention discloses a rapid start method for heavy oil reservoir steam assisted gravity drainage. The rapid start method for heavy oil reservoir steam assisted gravity drainage comprises the following steps that (1) a steam injection well and a producing well are electrically heated at a large power; (2) a solvent is injected into a long oil pipe and a short oil pipe of the steam injection well and a long oil pipe and a short oil pipe of the producing well at the same time; (3) a solvent and steam liquid mixture is injected into the long oil pipe and the short oil pipe of the steam injection well at the same time, the solvent and steam liquid mixture is injected into the long oil pipe of the producing well, and the short oil pipe of the producing well discharges liquid; (4) electric heating is stopped, pure steam is injected into the long oil pipe of the steam injection well and the short oil pipe of the seam injection well at the same time, and the long oil pipe and the short oil pipe of the producing well discharge liquid at the same time. Compared with a conventional preheating start method, time is shortened by over two thirds, so that the heat energy utilization rate is greatly increased, rapid preheating start of SAGD can be achieved, and the production speed of SAGD is increased. In addition, through rapid solvent volume expansion and super fracture pressure injection, an even oil drainage channel can be established, and the purposes of increasing the yield and the recovery rate are achieved.