Embodiments of the present invention disclose a heat dissipation apparatus, a heat dissipation control method, and a controller. The heat dissipation apparatus in the embodiments of the present invention includes: a main water pipe (100), a branch water pipe (101), a water pump (103), a sensor (104), and a controller (105), where the controller (105) is connected to the sensor (104) and the water pump (103), so that the controller (105) correspondingly adjusts the water pump (103) according to the current pressure difference and a preset pressure difference, to control a flow capacity of coolant flowing into the branch water pipe (101), until an absolute value of a difference between the current pressure difference and the preset pressure difference is less than or equal to a preset error amount. According to the embodiments of the present invention, the controller (105) can adjust, according to a difference between inflow pressure of the coolant flowing into the branch water pipe (101) and outflow pressure o
