The invention discloses a hot water supplying system for a vehicle. The system is composed of an original vehicle engine, anti-freezing solution pipes, anti-freezing solutions, a parking fuel heater, a hot water tank, a stainless steel corrugated pipe, a hot water pump, quartered steel wire hoses and a faucet. The original vehicle engine is connected with the parking fuel heater and the hot water tank in sequence through the anti-freezing solution pipes, the anti-freezing solution pipes pass through water in the hot water tank, and the stainless steel corrugated pipe is further arranged in the hot water tank. The other end of the hot water tank is sequentially connected with the hot water pump and the faucet through the quartered steel wire hoses. The hot water supplying system is applied in the travelling process and in parking, and the difficult problem of hot water supplying of an existing vehicle is solved; and meanwhile, according to the hot water supplying system, the problem of energy waste can further be effectively solved, the utilization rate of vehicle fuel energy is greatly increased, and the environmentally-friendly saving characteristic is achieved.