The present invention discloses a tape dispenser which includes a body having a downward facing concave space at a bottom thereof, a cutting blade mounted to the body and positioned in the concave space with an cutting edge recessed in the concave space, a groove member being able to move vertically between a first and second location, at the first location, the groove member being partially submerged in the concave space and pocketing at least a portion the cutting blade for cutting a piece of tape, at the second location, the groove member being downwardly away from the bottom of the body for threading a piece of tape through a gap formed between the groove member and the bottom of the body, a side plate attached to an end of the groove member, the side plate being slidably accommodated in a hollowed space formed inside the body, the side plate having a slot for retaining a spring to urge the side plate to slide downwardly resulting in the groove member to move from the first location to the second location, and a stopper situated within the slot and at an upper end of the spring, the stopper being fixed to the body and preventing the side plate from being completely pulled out of the hollowed space.