A lithium iron phosphate positive electrode plate, comprising: a positive electrode current collector; and a positive electrode active material located on the positive electrode current collector, wherein the positive electrode active material comprises: first lithium iron phosphate particles having a volume average diameter D50 of 60 nm to 300 nm, optionally 60 nm to 200 nm, and a specific surface area greater than 15 m 2 /g, optionally 15 m 2 /g to 25 m 2 /g; and second lithium iron phosphate particles having a volume average diameter D50 greater than 800 nm, optionally 1000 nm to 1500 nm, and a specific surface area smaller than 10 m 2 /g, optionally 5 m 2 /g to 10 m 2 /g, characterized in that: the first lithium iron phosphate particles and the second lithium iron phosphate particles are distributed in layers in an active substance layer in the lithium iron phosphate positive electrode plate, and a second lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface of the positive electrode current collector; and a first lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface, opposite to the positive electrode current collector, of the second lithium iron phosphate particle layer. a positive electrode current collector; and a positive electrode active material located on the positive electrode current collector, wherein the positive electrode active material comprises: first lithium iron phosphate particles having a volume average diameter D50 of 60 nm to 300 nm, optionally 60 nm to 200 nm, and a specific surface area greater than 15 m 2 /g, optionally 15 m 2 /g to 25 m 2 /g; and second lithium iron phosphate particles having a volume average diameter D50 greater than 800 nm, optionally 1000 nm to 1500 nm, and a specific surface area smaller than 10 m 2 /g, optionally 5 m 2 /g to 10 m 2 /g, characterized in that: the first lithium iron phosphate particles and the second lithium iron phosphate particles are distributed in layers in an active substance layer in the lithium iron phosphate positive electrode plate, and a second lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface of the positive electrode current collector; and a first lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface, opposite to the positive electrode current collector, of the second lithium iron phosphate particle layer. the first lithium iron phosphate particles and the second lithium iron phosphate particles are distributed in layers in an active substance layer in the lithium iron phosphate positive electrode plate, and a second lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface of the positive electrode current collector; and a first lithium iron phosphate particle layer comprising the second lithium iron phosphate particles is disposed on a surface, opposite to the positive electrode current collector, of the second lithium iron phosphate particle layer.