HC supply device and supply method for DPF regeneration in exhaust gas post-treatment system

The invention discloses an HC supply device for DPF regeneration in an exhaust gas post-treatment system. The HC supply device comprises an upper cover and a base, a cavity is defined by the upper cover and the base, a mounting bracket is arranged in the cavity, a motor is connected with one end of the mounting bracket, an oil pump is connected with the other end of the mounting bracket, the motoris connected with the oil pump through a coupling, an oil inlet pipe is connected with an oil inlet of the oil pump, an oil outlet pipe is connected with an oil outlet of the oil pump, a solenoid valve is arranged on the oil outlet pipe, a first through hole used for allowing the oil inlet pipe and the oil outlet pipe to pass through and a second through hole used for allowing the line to pass through are formed in the front side wall of the upper cover, the oil inlet pipe is used for being connected with an oil tank of a motor vehicle, and the oil outlet pipe is used for being connected witha DPF device of the motor