The invention provides a portable color paste spraying device. The device comprises a rotating cylinder, a front circular plate, a rear circular plate, a mounting flat plate, a spray pipe, a motor, anair cylinder and color paste cylinders; the rotating cylinder is provided with six to nine circular grooves which are uniformly distributed in the circumferential direction, the color paste cylindersare arranged in the circular grooves, the front ends of the color paste cylinders are provided with extension parts with openings, and rubber pistons capable of sliding along the cylinder walls are arranged in the color paste cylinders; the front circular plate and the rear circular plate are vertically and fixedly connected to one side of the mounting flat plate, the two ends of the rotating cylinder are rotationally connected to the front circular plate and the rear circular plate through a rotating shaft, the spray pipe is vertically fixed on the front circular plate, the motor is fixed onthe rear circular plate, and an output shaft of the motor penetrates through the rear circular plate to be in power connection with the rotating shaft of the rotating cylinder; and the air cylinder is fixed on the motor, a piston rod of the air cylinder can penetrate through the rear circular plate to abut against the rubber pistons, a handle is arranged on the mounting flat plate, and two switches for controlling the motor and the air cylinder to start and stop correspondingly are arranged on the handle. The proper color paste cylinder can be selected through rotation of the motor, and the air cylinder drives the rubber pistons to move forward so that various color paste can be sprayed in the spray pipe.